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You can chop the barrel on a shotgun to less than 18" on a Form 5320.1 and associated hoops to jump through. And you can make a shotgun compliant with 922r with a certain number of domestic parts.

Welcome! You’re just down the road from me (Tri Cities area)

Spf to you, message sent.

The M2 has a rear spring that IMO is a bit soft, secondly as noted recoil spring tolerances, vary from gun to gun, wish they were better. With that I replace M2 recoil springs in most cases with a Wolff OEM power spring, and have had improved performance and less tolerance variation from spring to spring. Your photo which is nice does not provide details such as: is this a new shell going forward or the old shell not ejecting. Underestimating the importance of shouldering a inertia recoil gun is quite often a difficult conversation with gun owners, it in many cases evokes a responses that discounts, minimizes and deflects its importance in core cycling issues. Please let me know if I can help.

Yes. It will work. You would need the larger M21 thread size. I actually helped out another forum member regarding this earlier in the year and they installed it without issue.

Benelli does make a 14.5 M3 http://www.benellidefense.it/products/m3-145-telescopic-stock But I have no clue if there are any additional considerations, like you mentioned, for the semi-auto cycling when the barrel is shortened. I wouldn't go past the 14.5 at least for a SBS

Your statement “You cannot put the 18 back on and sell the weapon” is incorrect. “Once a machine gun always a machine gun” is correct. That is not true with short barreled rifles or shotguns. How can it be a short barreled shotgun if it doesn’t have a short barrel? It is what it is as it is configured at that moment. A form 1 is the form used to make and register a title 2 firearm. A form 4 is the form to transfer a title 2 from one individual or organization to another. I make this statement not to be a dick, but to correct an inaccurate statement for those who may be interested in title 2 firearms. https://www.ar15.com/forums/Armory/Deregistering-a-SBR-lower/17-522768/

ATF has the right to audit any dealer’s records to confirm they are correctly processing the paperwork and keeping the records required. I had a class 3 FFL some 20 years ago. While they can show up at your place of business unannounced for that audit, they always made an appointment. They are not free to wander the premises, they’d need probable cause and a warrant to root through your property. Bad record keeping could be a cause for that warrant. They will see a gun in the bound book and will ask you to provide it to them, confirm it matches the description on the form 4, and then ask for the next. They had a policy of auditing class 3 dealers on an annual basis. But this process, although more often then “regular” dealers, is the same for both. When I sold my last title 2 and noted its disposal in my bound book I did not renew my Special Occupational Tax. Then ATF came for their annual audit they stated I had not renewed my SOT. I indicated I no longer had title 2s on the books and that was the end of that. I kept my “standard” FFL for a few more years and then closed that as well and shipped the bound book off to the FFL out of business address. As an individual or non-licensee who happens to own a title 2 firearm, your rights are the same as any other gun owning individual. Probable cause is required to search your home.

I agree, you are free to bounce back and forth 14 to 18 to 14 and back. My point is that once registered as an SBS, the receiver will always be an SBS. All NFA rules,regulation and laws will forever follow that receiver. You cannot put the 18 back on and sell the weapon without a form 1 NFA tax stamp transfer.

OK....form 1, form 2, form 52, those numbers are irrelevant. Fact of the matter is, it's the receiver that's registered not the barrel. Try out your theory. Swap your 14" barrel back to 18", take it to a gun shop and offer to sell it to them. Agree on a price, then tell them, "oh by the way it's a registered SBS". I'm fairly certain they will kindly change their mind. I could be mistaken but I think not.