03-06-2019, 06:18 PM
Your recoil spring may be weak? When pushing the round out of a mag, it may not have enough force to push the round all of the way into the chamber. Are yo using an adjustable gas block? Could the bolt be short stroked? Check to make sure it holds open on an empty magazine. If not, increase gas till it locks.
You may have already quantified this using the forward assist but needs to be considered anyway.
The other issues could be related to ammo. Factory or reload? If reload it could be resizing issues, check your case specs, length, diameters etc... I have seen excessive cartridge headspace resulting in cartridges that will not fire, hard to remove from the chamber etc..... Typically I resize mine to 1.211. Factory ammo generally run to about 1.209.
You may want to check your chamber specs, like headspace tolerances using a go or no go gauge. If you take an chamber a round using your hand, finger to push it into the chamber, does it fall out when you tilt the barrel up?
Not going into battery is a real issue and can be dangerous if it actually fired while not in full battery. I believe that is what is occuring, it not going into battery. I would check the lugs on the bolt also to see if they have any signs that may indicate what is going on. For example, excessive wear on the back side of the lugs. I realize this is a new build but you never know.
Check your firing pin to make sure it is the right length.
You may have already quantified this using the forward assist but needs to be considered anyway.
The other issues could be related to ammo. Factory or reload? If reload it could be resizing issues, check your case specs, length, diameters etc... I have seen excessive cartridge headspace resulting in cartridges that will not fire, hard to remove from the chamber etc..... Typically I resize mine to 1.211. Factory ammo generally run to about 1.209.
You may want to check your chamber specs, like headspace tolerances using a go or no go gauge. If you take an chamber a round using your hand, finger to push it into the chamber, does it fall out when you tilt the barrel up?
Not going into battery is a real issue and can be dangerous if it actually fired while not in full battery. I believe that is what is occuring, it not going into battery. I would check the lugs on the bolt also to see if they have any signs that may indicate what is going on. For example, excessive wear on the back side of the lugs. I realize this is a new build but you never know.
Check your firing pin to make sure it is the right length.