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.

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.