Originally Posted By Jason_R:
Awesome shotgun! Some questions for you:
Where'd you get the stock and grip? Is it custom? What about the flash hider and the rail on the foreend? I want to build an m3 like this (i have an m1 and love it!)
Who did the work?
Barrel cut down to 16 ¾ from 18 ¾ by professional gunsmith. 5-slot flash hider with “strike” points from www.tromix.com Front blade sight was replaced with low profile-snag free, BB style sight. BB is oversized. Barrel was tapped and threaded to receive sight. All of this work was done by professional gunsmith in Lousiville ky. at Firearms Service Center. Marc Henry is the gunsmith and he has been helping me on my Frankenstein projects for years.
A clamp on bayonet lug was manufactured and installed on barrel/mag tube. The clamp part itself is an Uncle Mike’s product and the bayonet lug is from www.deltaforce.com It is a clamp on .750 bayonet ring for ARs. I cut the lug off of it and had my gunsmith weld it on to the Uncle Mikes clamp. Bayonet lug accepts AR-15/M-16 bayonets with slightly modified bayonet ring. You have to use a dremel to widen the I.D. of the bayonet ring to fit over the flash hider. I did this part.
Permanently mounted polymer picatinny rail attached to upper left side of forend. I just drilled two holes through the forend and attached with allen head screws and flange nuts. Be careful in your placement!!!! You put it in the wrong place and you will not be able to get your forend back on. Anyone want to guess how I know this???
Original pistol grip/butt stock removed and an ACE left-side folding skeleton stock with 1” thick recoil pad added (http://www.riflestocks.com/shotguns.htm) A new metric receiver screw (thread pitch 19mm right hand thread metric!!!) was manufactured out of steel by my gunsmith and installed in back of receiver using original mounting hole. One of ACE’s Remington 870 receiver adapter blocks was heavily modified to fit the Benelli receiver (I did this part of the conversion). The Benelli receiver is wider than the adapter block and there is an ugly gap between the back of the trigger guard and the front strap of the adapter block. I filled this and shaped and contoured it with Brownell’s Acraglass (http://www.brownells.com/aspx/NS/store/catsearch.aspx?k=acraglass&ps=10&si=True)
ACE butt stock, adapter, and folding mech are the same length as the original Benelli butt stock. You have the option of mounting any length or style of ACE stocks offered. You can eliminate the folding mech. The original butt stock can be re-installed also. No permanent modification was done in this area!!!!!!!!!!!!
The Benelli’s moveable front sling attachment gives you ambidextrous capabilities through it’s design. The ACE stock can only fold to the left. Folding to the right interferes with the charging handle and ejection. The ACE sub machine gun folding mech (http://www.riflestocks.com/adapters.htm) has sling attachment on it. That will take care of a sling stud on the right hand side of gun. For the left side, there is plenty of meat in the adapter block to drill a hole to accept an Uncle Mike’s coarse thread sling stud.
An Ergo pistol grip is attached to the receiver adapter block. The ERGO grip has to be slightly modified (a little material removed from the grip itself for a flush fit on the adapter block. It will take any pistol grip that an AR-15 will take.
The pistol grip, receiver adapter block, and forend is heavily textured. The gun was refinished in a three color Duracoat (black, tan, green) woodland camo pattern.
There you have it. That is how you would do it. A bunch of work and a lot of money. I spent $400 on the conversion. Not cheap.