HMB12 Smooth Bore Firearm Project Using AR Receiver(s).

[arakboss]

Hey @matts , hold my beer.

I think many people fail to appreciate the flexibility that the AR platform provides. My latest idea to demonstrate that flexibility is to design a 12ga barrel that can used with either a lower or upper AR receiver, possibly both. We have already seen 410 uppers commercially available so moving on to 12ga and skipping 20ga seems like a logical evolution. Slam fire style seems too easy so if you have any ideas for incorporating the AR15 trigger system, please share. This project idea is in the infancy stage so stay tuned for more detailed ideas on how this could be put together.

Edit: An advantage of this firearm project is that a virgin receiver can used which will allow a legal short barrel Firearm to be made comparable to the mossberg shockwave in OAL dimensions but with an even shorter barrel.

Read More

 

[arakboss]

Looks like a commercial 12ga upper is being made for 308 ARs. Out of my budget range though.

Shotgun Parts For Sale Up To 86% Off | Brownells

Shop Shotgun Parts Products at Brownells with 1,361 items including Shotgun Receiver Parts, Shotgun Triggers & Parts, Shotgun Forends & Parts, Shotgun Stocks & Parts, & Shotgun Bolt Parts Up To 86% Off From Top Brands like BERETTA USA, BROWNING, BENELLI and more.

www.brownells.com

Edit: And surprise a belt fed 12ga upper for AR15. Again will probably be out of my price range if it hits the market.

Belt-fed 12 gauge

What would you call this thing other than an light machine-shot-gun? (Make sure you swap the barrels out to keep anyone without a sense of humor happy).

blade-city.com

 

[matts]

Sick idea bro....

 

[arakboss]

I have decided for my first 12ga AR attempt to go with a simple slam fire design. Barrel length will be the minimum length necessary to achieve a 26+ inch length so it can be classified as a "Firearm"

If I can make this functional, the next design will incorporate a locking barrel and use the factory AR trigger system.

Pipe gathering and prep will begin this week.

This guy went overkill imho but it turned out pretty sweet.

 

[arakboss]

An idea for a 28ga bullpup configuration just popped up into my head. The mind is working overtime tonight