Benelli m4 o ring damaged

T

TK-Hryciuk

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Hey guys so I picked up an m4 last Thursday and I've shot about 200 rounds through it. Tonight when I cleaned and disassembled the bolt and carrier I noticed the firing pin retainer o ring was damaged. It appears like it came like that from the factory but I am unsure. The o ring has been cut and it fits snug on the carrier but I'm worried it may come loose and damage my shotgun later on. I've tried to install it with a different portion of the o ring but it doesn't seem to want to fit without being gouged. Can anyone give me some insight or advice on this predicament? Thank you very much!

Edit: Also guys, the barrel does not fully seat on the receiver I just noticed with the handguards in place. With them off it seats flush against the receiver. Is this a cause for concern? The gap is just big enough to let a piece of paper fit in but it has shot perfectly fine since I got it but will this cause a problem later on? Thanks again.
 
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Hey guys also noticed that the adjustment notches on the recoil tube are quickly polishing. From pictures and what I can see they don't usually have that kind of wear. This normal as well? I was shooting in the cold a few days ago so I don't know If that made a difference or not.
 
Is this a new gun or did you buy used?

If its new and you have concerns, talk to the people you bought it from.

The rubber o-ring shouldn't be getting cut up like that, but its an easy fix to replace it.
It may have got pinched during reassembly and cut.

"adjustment notches on the recoil tube are quickly polishing"
I don't know what this means.
If you can post a picture, someone will be able to tell you if it is normal or not.
 
It isn't just the notches that the finish wears off of. Be careful not to let pressure off the locking button you press to collapse the stock while adjusting it or it will scratch the recoil tube up pretty good. I was a little annoyed when this happened to mine as I spent $2100 on the gun but I got it to use not hang on the wall so I'm okay with it. I am more concerned with the scratch I put on the finish crawling under a barb wire fence. That makes three of my guns with scratches from fences now.
 
Yeah I'm not too worried about finish, mainly if it begins to peen from wear and the stock doesn't secure as well as it should. As for not seeing any wear on others recoil tubes, I realized its probably because most of them in the states aren't allowed to purchase the collapsible models ergo no wear on them. If anyone could post a picture of their recoil tube with the stock off so I can compare that would be awesome. I would post a pic of mine but I am away on work right now. As for the barrel, I realized it doesn't fully seat due to the spring under the barrel mount where the handguards lock in is just tight. I gave it a little pressure and it fit perfectly.
 
Sorry about the crumby picture.

m4recoiltube.jpg


I guess my full extension notch is also a little polished. I never noticed it until I took the picture. You can see the scratches from collapsing the stock as well. I want add another notch inbetween the full extension notch and the takedown/removal notch. I was worried abut wrecking the finish but I guess it's already coming off.
 
Thanks you guys are awesome I appreciate it. If they're heat treated I assume they will polish out but not be able to peen which is what I was worried about.
 
Heat treating changes how the bluing takes to the metal, so they my not polish out "its a combat shotgun, get her dirty and beat her up abit ;)"
 
Had to replace an O-ring in one of the piston assist thingies when mine was new. Same deal, got cut during assembly. Same result, no biggie. I get em free but you can buy O-ring kits from prince ass auto pretty cheap and you're covered. The ones in the piston assist are static. All they seem to do is keep the blow back (dirty gas) off the threaded portion of the thing. Probably a good idea to check this as those threads are pretty fine and could guck up in time and O-rings are cheap as dirt.
 
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