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Home > BULLPUP SHOTGUNS > BPU870 - Remington Kit
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BPU870 - Magazines BPU870 - Muzzle Devices
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BPU870 - Slings/Swivels/Mounts BPU870 - Stocks/Conversions/Parts
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Bullpup Unlimited Shotgun Conversion Kit (for the Remington 870) Mepro Tru-Dot® Red Dot Sight (RDS) - 1.8 Dot Reticle Mepro M21 Self-Powered Day/Night Reflex Sight
Our Price: $297.99
Our Price: $399.99
Sale Price: $349.99
Our Price: $524.99
Sale Price: $479.99
Bullpup Unlimited Shotgun Conversion Kit (for the Remington 870) Mepro Tru-Dot® Red Dot Sight (RDS) - 1.8 Dot Reticle Mepro M21 Self-Powered Day/Night Reflex Sight
Convert your 870 shotgun into a compact, well balanced 12 gauge Bullpup!

This stock is easy to install, and drops almost 10" off the length of your shotgun.

This is conversion kit, you supply the 870!
The Mepro Tru-Dot® RDS is an energy-efficient, compact sight, that provides thousands of operating hours while utilizing a single "AA" battery. Featuring battle-proven LED technology and rugged design, the sight assures reliability under the harshest environmental conditions. With its large display window and clearly-defined Red-dot, the Mepro Tru-Dot® RDS ensures rapid target acquisition with both eyes open. Offering four easily switchable reticle brightness intensities, the Mepro Tru-Dot® RDS fits every tactical scenario.

1.8 MOA Dot Reticle

Made in Israel
The Mepro M21 is a dual powered 30mm Reflex Sight, which collects sunlight in the day and uses tritium at night. Designed through close collaboration with Israeli Special Forces, the M21 was the first reflex sight in the world designed for close quarter combat, and has been continually improved, making it one of the most advanced sights available today. Bullpup Armory gets the most current production pieces, so these sights have the latest improvements (M revision).

Choose your reticle (Bullseye or Triangle)
Made in Israel.
MEPRO TRU-DOT RDS PRO MIL-SPEC RED DOT SIGHT Mepro MX3 Magnifier Remington 870 Magazine Tube Extention 12GA - 2 additional shells
Our Price: $649.99
Sale Price: $599.99
Our Price: $529.99
Sale Price: $449.99
Our Price: $49.99
MEPRO TRU-DOT RDS PRO MIL-SPEC RED DOT SIGHT Mepro MX3 Magnifier Remington 870 Magazine Tube Extention 12GA - 2 additional shells
The MIL-SPEC, Mepro RDS PRO is exclusively available in the United States. Outside of the U.S., the RDS PRO is known as the Mepro M5 which is standard-issue to the most elite fighting forces and law enforcement agencies worldwide.

The Mepro RDS PRO is a MIL-SPEC, energy-efficient, compact sight that provides thousands of operating hours while utilizing a single “AA” lithium battery. With battle-proven LED technology and a rugged MIL-SPEC design it performs under the harshest environmental conditions.
With its large display window and clearly defined red dot, the Mepro RDS PRO ensures rapid target acquisition with both eyes open. Offering four easily switchable reticle brightness intensities, the Mepro Tru-Dot® RDS series optics fit every tactical scenario.

1.8 MOA Dot Reticle

Made in Israel
The MEPRO MX3 provides a decisive solution for any operator in the field. Its 3x magnification enhances the precision and effectiveness of reflex sights such as the MEPRO 21 and the MEPRO MOR. Attaches to any Mil-Std 1913 rail and has a quick detach lever.
Made in Israel.
Genuine, factory brand Remington Model 870 12 Gauge Magazine Extension Kit increases mag tube capacity by 2 extra rounds, to fit the 18" barrel. All-steel extension tubes attach directly to the end of the magazine tube. Includes a magazine clamp, although that piece is not used with the BPU870 conversion kit. Magazine spring is formed from high strength music wire that resists "set" and won't weaken over time. Matte blued finish.

Made in USA.

Remington 870 Magazine Tube Extention 12GA - 3 additional shells Remington 870 Magazine Tube Extention 12GA - 2 additional shells - PARKARIZED Remington 870 Barrel - 18-5inch matte
Our Price: $54.99
Our Price: $54.99
Our Price: $99.99
Remington 870 Magazine Tube Extention 12GA - 3 additional shells Remington 870 Magazine Tube Extention 12GA - 2 additional shells - PARKARIZED Remington 870 Barrel - 18-5inch matte
Genuine, factory brand Remington Model 870 12 Gauge Magazine Extension Kit increases mag tube capacity by 3 extra rounds, to fit the 20" barrel. All-steel extension tubes attach directly to the end of the magazine tube. Includes a magazine clamp, although that piece is not used with the BPU870 conversion kit. Magazine spring is formed from high strength music wire that resists "set" and won't weaken over time. Parkerized finish.

Made in USA.

Genuine, factory brand Remington Model 870 12 Gauge Magazine Extension Kit increases mag tube capacity by 2 extra rounds, to fit the length of the 18" barrel. All-steel extension tubes attach directly to the end of the magazine tube. Includes a magazine clamp, although that piece is not used with the BPU870 conversion kit. Magazine spring is formed from high strength music wire that resists "set" and won't weaken over time. Parkarized finish.

Made in USA.

Upgrade that tired, old Remington 870! This is a replacement barrel for the 870, that will work perfectly with the Bullpup Unlimited conversion kit. Made by Mossberg.
12ga
18.5" barrel
matte finish
bead sight
cylinder bore (won't accept chokes).

Check your local rules and laws about installing a new barrel. Barrel length and Overall length can come into play in some areas. Restocking fees may apply.

Magpul Back-Up Sight Pro - Front (MBUS Pro) Magpul Back-Up Sight Pro - Rear (MBUS Pro) Magpul Back-Up Sight Pro LR - Adjustable Rear (MBUS Pro LR)
Our Price: $80.99
Sale Price: $72.99
Our Price: $99.99
Sale Price: $84.99
Our Price: $122.99
Magpul Back-Up Sight Pro - Front (MBUS Pro) Magpul Back-Up Sight Pro - Rear (MBUS Pro) Magpul Back-Up Sight Pro LR - Adjustable Rear (MBUS Pro LR)
The MBUS® Pro is a corrosion resistant all-steel back-up sighting solution that delivers maximum functionality and strength with minimum bulk at a price that's even smaller than its size. The dual aperture (windage adjustable Rear and no-tool, elevation adjustable Front) excel in all 1913 Picatinny rail mounting applications, including rail-height gas blocks.

Positive detents keep the MBUS PRO Front and Rear at standard AR sight height when deployed, and so low when they are stowed that you'll never notice them until they're needed. Narrow width Front is compatible with most IR aiming laser and light installations for the professional user.

Made in U.S.A.
The MBUS® Pro is a corrosion resistant all-steel back-up sighting solution that delivers maximum functionality and strength with minimum bulk at a price that's even smaller than its size. The dual aperture (windage adjustable Rear and no-tool, elevation adjustable Front) excel in all 1913 Picatinny rail mounting applications, including rail-height gas blocks.

Positive detents keep the MBUS PRO Front and Rear at standard AR sight height when deployed, and so low when they are stowed that you'll never notice them until they're needed. Narrow width Front is compatible with most IR aiming laser and light installations for the professional user.

Made in U.S.A.

The new MBUS Pro LR capitalizes on the low profile and sleek styling of the original MBUS Pro, while adding the additional feature of elevation adjustments to accurately engage targets at variable distances. Built with all steel construction, this is the sighting solution that delivers no-tool adjustments, maximum strength, corrosion resistance, and functionality in a compact package. Positive detents keep the MBUS Pro LR at standard AR sight height when deployed and so low when stowed that you will hardly notice them.

Made in U.S.A.

Magpul MBUS Back-Up Sight – Rear GEN 2 Magpul MBUS Back-Up Sight – Front GEN 2 Homeland Guns WOR (Wash Out Remover) Kit for the Mepro21
Our Price: $55.49
Sale Price: $48.99
Our Price: $37.99
Sale Price: $33.99
Our Price: $29.99
Magpul MBUS Back-Up Sight – Rear GEN 2 Magpul MBUS Back-Up Sight – Front GEN 2 Homeland Guns WOR (Wash Out Remover) Kit for the Mepro21
• Low-cost, color injection molded, folding back-up sight
• Dual aperture Sight is adjustable for windage
• Fits all Milspec 1913 Picatinny rail equipped firearms
• Low-cost, color injection molded, folding back-up sight
• Adjustable for elevation
• Fits all Milspec 1913 Picatinny rail equipped firearms
The W.O.R. helps with the "wash-out" experienced when aiming the Mepro21 into a well lit area, from a dark area. The light collector on the Mepro21 has dimmed the reticle from the lack of light in the immediate area, although a brighter reticle is needed when pointed from the "dark" area into a "bright" area. The W.O.R. solves the issue! By installing the W.O.R. on the Mepro21, you can turn it on when a brighter reticle is needed.

Available in the original "On/Off" model, or a "Rheostat" (adjustable brightness) model.
CAA - 5 Position Laser and Light Mount 1" Mako - FAB Defense Quick-Release Offset Light Mount (1") Mako - FAB Defense Quick-Release Light Mount (1")
Our Price: $19.99
Our Price: $25.99
Our Price: $19.99
CAA - 5 Position Laser and Light Mount 1" Mako - FAB Defense Quick-Release Offset Light Mount (1") Mako - FAB Defense Quick-Release Light Mount (1")
Quickly move your light or laser from one side of the weapon to the other.
• Light or laser can be quickly repositioned for all situations
• Operator can easily access on/off button with thumb while using a vertical grip
• Locks in position at 0° 45° 90° 135° 180°
Quick release, offset/side, composite rail mount for most 1-inch lights. Quick release, in-line, composite rail mount for most 1-inch lights.
GGG 45 Degree Offset Accessory Rail Bullpup Unlimited 90-degree Side Rail Blue Force Gear VCAS Padded Sling
Our Price: $35.99
Our Price: $9.99
Our Price: $54.99
GGG 45 Degree Offset Accessory Rail Bullpup Unlimited 90-degree Side Rail Blue Force Gear VCAS Padded Sling
The 45-degree Offset Accessory Rail is an ambidextrous design, that allows for small micro red-dot optics to be mounted at a 45 degree anfle for close range engagements. A 90-degree side rail that positions a two slot picatinny rail in the optimal position for a side-saddle, or other rail accessory.
This side rail is intended for the Bullpup Unlimited conversions, but will work for other platforms with picatinny rails if the side clearance is enough to accept the mount. Designed to be symmetrical, so it can be mounted for use on either side of the firearm.
Durable polymer construction, but weighs just under an ounce.

Made in the USA!
The Vickers Combat Applications Sling has revolutionized the way rifles are carried. Ability to quickly transition from carrying a slung rifle comfortably to combat ready, the patent pending Quick Adjust has bridged the gap between the two primary uses of rifle slings – from transporting to fighting. The padded, two-point VCAS is available in Black or Coyote Brown.

Made in the USA!
Magpul MS3 Dual-ParaClip GEN2 Sling Magpul RSA QD Rail Sling Attachment Magpul MS4 Dual QD GEN2 Sling
Our Price: $48.99
Our Price: $28.99
Our Price: $58.99
Magpul MS3 Magpul RSA QD Magpul MS4
The MS3 Multi-Mission Sling System was designed to give a versatile weapon-retention solution for a multitude of tactical environments and missions. The rapidly-convertible MS3 allows an operator to leverage the maneuverability of one-point attachment for direct action, or two-point attachment for stability. Single-hand adjustments and quick-release, positive-locking hardware provide flexibility and durability in a truly adaptable sling system. The MS3 concept allows switching from Weapon Shoulder to Reaction Shoulder for shooting around corners, under vehicles, or to minimize exposure.

The MS3 GEN 2 incorporates a new low profile quick-adjust Slider which minimizes bulk and allows for secure, yet effortless, sling adjustment. Webbing length has also been increased for a comfortable fit with all body types and armor configurations.


Black or Coyote Brown
Made in U.S.A.

The RSA QD provides a sling attachment point for the MS4 and other QD sling systems • Steel construction • Melonite finish • Compatible with 1913 Picatinny rails

The MS4 can quickly switch between one-point and two-point configuration. The MS4 maintains material construction and specifications identical to that of the standard MS3, but features two heavy-duty push-button QD sling swivels rather than the Magpul Paraclip™ aling with a steel D-Ring to allow one to two-point convertibility. This modification allows compatibility with QD sling cups commonly found on lower receivers, receiver end plates, buttstocks, and many low-profile forward QD Sling mounts, including the Magpul RSA-QD.

The MS4 Dual QD GEN 2 incorporates a new low profile quick-adjust Slider which minimizes bulk and allows for secure, yet effortless, sling adjustment. Webbing length has also been increased for a comfortable fit with all body types and armor configurations.

Made in U.S.A.
Magpul RSA Rail Sling Attachment GG&G QD Rail Side Sling Mount QD Rail Sling Mount Low Pro 90 degree
Our Price: $28.99
Our Price: $44.99
Our Price: $19.99
Magpul RSA GG&G QD Rail Side Sling Mount QD Rail Sling Mount Low Pro 90 degree

• All cast steel construction • Mil-spec black manganese phosphate finish • Works on any standard 1913 Picatinny-spec rail

The Quick Detach Sling Mount For Dovetails keeps the weapon slung in the correct position to avoid canting outwards away from your body.The QD swivel socket has limited rotation built in to prevent sling wrap-up.
Accepts all Heavy Duty or Standard push button sling swivels.
Mount comes complete with one GG&G Enhanced Heavy Duty Rectangular QD sling swivel.

Perfect for the rear-lower rail of the RFB!

Made in the U.S.A.
The latest innovation in sling accessories from Damage Industries. Simple to use, low profile and versatile.

90 degree QD swivel mount, precision machined from 6061 T6 Aluminum alloy with Mil-A-8625 Type III Class 2 Hardcoat Anodized finish.

Perfect for the rear-lower rail of the RFB!

Made in the U.S.A.
Magpul MS3 Single-QD and Single-ParaClip GEN2 Sling Damage Industries Multi Mount Troy Mash Hook
Our Price: $54.99
Our Price: $19.99
Our Price: $9.99
Magpul MS3 Damage Industries Multi Mount Troy Mash Hook

Filling the same mission requirement as the standard MS3 Sling, the MS3 Single QD can quickly switch between one-point and two-point configuration. The MS3 Single QD maintains material construction and specifications identical to that of the standard MS3, but features a heavy-duty push-button QD sling swivel for the one-point (rear) weapon attachment rather than the Magpul Paraclip™. This modification allows compatibility with QD sling cups commonly found on lower receivers, receiver end plates, and buttstocks. The MS3 Single QD GEN 2 incorporates a new low profile quick-adjust Slider which minimizes bulk and allows for secure, yet effortless, sling adjustment. Webbing length has also been increased for a comfortable fit with all body types and armor configurations.

Made in U.S.A.
Attach your sling in multiple configurations on any 1913 rail. Mount it to the top, sides or bottom of your rifle with loop, QD swivel, snap-hook, Mash hook, or paracord. QD sockets have anti-rotational limits. Constructed of billet aluminum with Mil-A-8625 type III class 2 hardcoat anodize. Black. Swivel/hook not included. Sold individually.

Made in the USA!
MASH Hook (Metal All-purpose Snap Hook)
   
 

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