Scout_21

https://www.benelliparts.net/products/benelli-m4-14-sbs-short-barrel

Except for the 922r trigger kits and charging handles I believe so.

Unfortunately nature of the beast. I have 3 m4s and the engagement differed between all three. It must be a pia to try to design something that can deal with such a large variance

I can't really tell what's going on with those pics. Here's a good vid of taking down an m3

It's the magazine tube spring retainer https://www.midwestgunworks.com/page/mgwi/prod/60407 It would be number 67 on that above schematic for your shotgun. Other m3s have a disk. I do not know why this one is open and has that lip but I think it has to do with the limiter Also see here and here

Oh, that's not mlok on the spas-12. Its venting slots in the heatshield. It was a convertible shogun (pump and semi) and anything mounted in those sections would have interfered with the pump action.

Photos would help. Any chance these are what you’re describing? https://www.shopbenelli.com/stock-adjustment-kits.html

I'd certainly be interested in a SBS version

Not sure if this really helps but have you checked for any rough patches or metal slivers on all the cycling components? I’d probably do a full check on the argo pistons, bolt carrier, machining in the receiver, and remove the spring from the recoil tube to check those associated parts out as well. How does your follower look from the magazine. Any odd wear marks? I’m probably not adding anything you’ve already done though…

Ah, for a variant of the m3a1. Those probably won't have spare bits for quite some time seeing as Australia Defence Department just selected it for their shotgun.

do you mean this info https://www.benelliparts.net/products/benelli-61171-supernova-collapsible-stock-mr1 https://www.benelliparts.net/products/benelli-supernova-or-mr1-5-position-recoil-tube-1

https://www.swatmag.com/article/heliborne-shotgun-snipers/

I really like Vang Comp's elastic https://www.vangcomp.com/product/spare-carrier/ I honestly haven't found any better Just need some self adhesive hook and loop to put on the side of your m4 receiver

Freedom fighter tactical just listed some for sale… at the price of an entire shotgun.

Nice work! But why couldn't you do the same clamshell method of handguard assembly like the oem guard instead of needing screws to hold it together?

George Washington was a fan of public education. "I have heretofore proposed to the consideration of Congress, the expediency of establishing a National University; and also a Military Academy. The desirableness of both these Institutions, has so constantly increased with every new view I have taken of the subject, that I cannot omit the opportunity of once for all, recalling your attention to them…. Amongst the motives to such an Institution, the assimilation of the principles, opinions and manners of our Country men, but the common education of a portion of our Youth from every quarter, well deserves attention. The more homogeneous our Citizens can be made in these particulars, the greater will be our prospect of permanent Union; and a primary object of such a National Institution should be, the education of our Youth in the science of Government . In a Republic, what species of knowledge can be equally important? and what duty, more pressing on its Legislature, than to patronize a plan for communicating it to those, who are to be the future guardians of the liberties of the Country?"

They also make a 14” m2 that’s entirely inertia. Perhaps the extra half inch is what is required to operate an m3 on inertia.

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

Yeah curved stock with straight back of the m4 receiver doesn’t mesh well. If they’d gone with a more curved m2 receiver style or altered the stock to be straighter it could work. Probably just cheaper to reuse already molded parts for this update…

Is that why Benelli uses so much threadlocker?

So you’re down a barrel because of a faulty forend. Contact the forend maker or just buy a new barrel…. This isn’t rocket science.

I’m definitely down for two!

is it thinner than the stock recoil tube? Maybe an armor lube coating as it does add some lubricity… though I imagine it would be much more than cerakote

Happen to sell direct so you don't pay the ebay tax?

It functions well as a blunt device to strike an enemy