Nordic Components
8.35-inch +3B tube, cap, and spring kit that Nordic identifies as flush on an 18.5-inch Benelli M1/M2 barrel.
+15 more
Nordic's +3B MXT kit is the published flush-length tube geometry for an 18.5-inch Benelli M1 or M2. The current kit is 8.35 inches long and includes the extension tube, cap, and full-length spring. It still cannot mount to an M2 without NUT-BN-12-00. This guide also pairs it with BCL-12 to keep the barrel and extended tube supported as one system. Final shell count varies with shell length and the gun's original magazine configuration.

Smith & Wesson
Smith & Wesson M&P15 Sport III
Enhances home defense, range training, competition

Sig Sauer
Sig Sauer M400 Tread
Enhances home defense, range training, duty/patrol

Sig Sauer
Sig Sauer M400 Forge
Enhances home defense, range training, duty/patrol

Palmetto State Armory
PSA Sabre-15 M4A1 14.5" CHF Quad Rail
Enhances home defense, range training, duty/patrol

Radical Firearms
Radical Firearms RF-15 16" (15" RPR)
Enhances range training, home defense, duty/patrol

Canik
Canik TP9SFX
Enhances competition, range training
Add the Nordic Components MXT +3B 12 Gauge Extension Kit to your build and see how it enhances your platform.