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Question about Benelli M1 and M4 receivers.


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Hey y’all, I’m new to the forum and wondering if I could get some insight into some questions I’ve been pondering over a project.

 

I’ve recently acquired an M1 sporting special and noticed it has the same 2 circular opening at the front of the receiver that the M4 has. The m4 needs those openings for the gas pistons to cycle the bolt, but why on earth would an M1 need those openings?

 

The second question I was wondering is what stops the bolt in an m4 during its rearward movement? In my M1 I’ve found that the plunger in the recoil tube “bottoms out” on the recoil tube cap nut which stops the rearward movement of the bolt. The bolt doesn’t directly contact anything in the receiver to stop its movement. The plunger in an m4 is very small and doesn’t bottom out at the end of the recoil tube, so what stops the bolt? Does the bolt in an m4 directly contact something in the receiver to stop its rearward movement?

 

any input is much appreciated!

 

thanks,

 

Taylor C.

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Thanks for the swift reply! My first question seems real dumb at this point, but this makes sense now.

 

Does the rear of the receiver wear excessively where the bolt carrier impacts it?

 

Reason I ask is I have an m4 recoil tube and collapsible stock and I figured I would throw it onto my new M1. Just trying to figure out if I should modify my M1 recoil tube plunger to bottom out in the m4 recoil tube (just like it would in the m1 recoil tube).....or if I should just use the short m4 plunger and let the bolt carrier contact the rear of the receiver. I’m just afraid if the m1 receiver wasn’t designed to make contact with the bolt carrier than it may wear excessively and eventually destroy it.

 

thoughts?

Edited by tcherkas
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Thanks for the swift reply! My first question seems real dumb at this point, but this makes sense now.

 

Does the rear of the receiver wear excessively where the bolt carrier impacts it?

 

 

Reason I ask is I have an m4 recoil tube and collapsible stock that I got a while back for a cheap trade and figured I would throw it onto my new M1. Just trying to figure out if I should modify my M1 recoil tube plunger to bottom out in the m4 recoil tube (just like it would in the m1 recoil tube).....or if I should just use the short m4 plunger and let the bolt carrier contact the rear of the receiver. I’m just afraid if the m1 receiver wasn’t designed to make contact with the bolt carrier than it may wear excessively and eventually destroy it.

 

thoughts?

Hang on to your c stock and flip it when the time is right. Honestly what you propose is a PITA, and the m4 c stock just isn't that hot.

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