Benelli USA is the …

gunsmith note(s):

• On a Benelli shotgun, if the recoil spring tube is steel the receiver threads are 19 mm.¹
• On a Benelli shotgun, if the recoil spring tube is aluminum the receiver threads are 21 mm.²

related:

• The Benelli USA website: http://www.benelliusa.com/ ⇒
• The Benelli Italy website: http://www.benelli.it/en ⇒

1. SRM Performance Products. <a href=”https://www.surecycle.com/products/bnl-01″>”Sure Cycle BNL-01.”</a> <i>Sure Cycle High Performance Shotgun Accessories.</i> SRM Performance Products, n.d. Web. 08 May 2017.
2. SRM Performance Products. <a href=”https://www.surecycle.com/products/bnl-01″>”Sure Cycle BNL-01.”</a> <i>Sure Cycle High Performance Shotgun Accessories.</i> SRM Performance Products, n.d. Web. 08 May 2017.