I haven’t seen any AR that won’t release the bolt carrier when a sharp rap is delivered to the back of the stock.
With the ramped carrier, you don’t need to use the 9mm hammer. The notch cut in the hammer could be hanging things up on the back of the ramp. Try a standard 5.56 AR hammer.
Your bolt catch is like mine- it’s kinda smooth at the top- not as sharp and tall as others I’ve seen. A new one might fix your problem with the bolt slamming home unwanted.
You need to try an unnotched AR15 hammer. It’s pin hole sized is the ‘mil-spec’ .154" but the top of the hammer is like a M16 hammer but with the sear tail bobbed off.
That’s what I’m running in mine. I think it’s a burst hammer with the sear catch milled off.
The 9mm hammer with the notch in the face was snagging on the area below the firing pin and not allowing smooth rearward travel of the bolt. I’m sure on non-ramped bolts it doesn’t do this.
OK,new hammer worked and its now cocking like its supposed to…New issue has come up now…Extraction sucks…Its chambering a round before the spent casing is cleared…:mad:
Are you sure you have the proper 9mm buffer and spring? Can you post a picture of them? Also, what stock is on your carbine…an A2 stock requires a spacer in the rear of the receiver extension.
If you have the correct 9mm 5.6oz steel buffer and a carbine standard rate spring.
It sounds like weak ammo. Make sure that nothing is slowing the bolt down. Try lubing it very well and feel for binding anywhere (with an empty mag seated). If it’s not binding it could be that the ammo is too weak. Try this if using Colt, C-products or Pro mags (if the mag will lock the bolt open manually when the mag is empty). Put 1 round in the mag and fire it. Try this several times it should lock back every time other wise bolt velocity is too slow or ammo is too weak.
Top buffer is the one out of my M4,bottom one is what Im running on the 9mm.Noticable weight difference between the two with the 9mm being the heaviest.
Stock is 4 postion adjustable.
Only mags I have access to are C-Products…Bolt is locking back after last round…Have been lubing bolt every 40-50rds…
Same problem was happening with different ammo.Ran 3 different brands of 115gr and 1 brand of 147gr…147gr didnt do it as often,but still did the same thing…
Cant feel any drag spots while manually cycling the action
No, that’s not the case. It’s doing what mine does. It’s just not EJECTING the case. The case is bouncing around inside the receiver while the bolt is going forward and loading the next round in.
I can’t get my ejector bent over far enough to knock those damn cases out though.
My problem may be light loads as they are subsonic so if you are having the same symptoms it may be that the bolt is not traveling far enough rearward.
I thought this may be the case for me so I put in the H2 and I still have problems.
Next step is to put it all back on the A1 RO635 upper and start from scratch again…
ETA: GotM4- he was talking about Milspec in regards to the bolt catch. My bolt catch in the old style noveske lower is not as tall and sharp as some I’ve seen. It does not hold the bolt securely.
