We offer several different versions to suit your preference in ammunition, as well as length. 12 and 20 Gauge shotgun adapters are our most popular adapters. Followed closely by the 410. 16 Gauge is something we plan on expanding in the future. Warning! However, not all shotguns are capable of handling all of the shotgun adapters we offer.. 2018. 3. 29. · Legal Handgun Accessories. Most accessories you may want to add to your handgun are legal under federal law. However, there are two big exceptions. If you 1. add a vertical foregrip or 2. stock to your handgun, you have made it a NFA weapon. This is illegal to make or possess without ATF approval and a tax stamp. 2022. 2. 10. · Newly Proposed Pistol Brace Laws Explained. The laws governing pistol braces have gone back and forth quite a bit in recent years. First, the ATF said you could not shoulder the brace because doing so would turn it into a short-barrel rifle. Then they changed their mind and said that you could shoulder the brace without turning it into a short. "/>Are shotgun adapters legal