Here is the scoop brand new rifle never been shot just finished building. BCM bcg came in today. I gave it a light lube and slapped it in the assembled rifle. I cycled a few rounds through it and now it is stuck in the forward position with a live round in it. It will unlock but the bolt wont spin. I have never seen this before, I was an infantryman so I have shot a ton so please no flames. I have come to you all for help. Please be gentle.
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HELP, Bolt Stuck in Upper.
- Thread starter DocBrown
- Start date
Doc, take a close look at your fired case.
If you observe any of the following:
a. Expanded/ruptured case head
b. Primer missing/oblong primer pocket
c. Shiny ring around the circumference of the case head
d. A small shiny circle on the case head (imprint of the ejector)
STOP!
Do NOT fire any more of that ammunition. You may be experiencing bullet setback upon feeding. This is caused by the bullet not being crimped properly, or an improperly cut feed ramp where the bullet is slamming into it upon feeding.
Take a close look; if any of the above signs are present, you are on the knife edge of disaster. Inspect it carefully before firing it again.
EDIT: I noted that you said you "cycled" rounds through it. If these were live rounds--and you did not fire the rifle--the rifling might have grabbed/engraved the bullet. Get some action proving dummies, and it might solve the problem.
If you observe any of the following:
a. Expanded/ruptured case head
b. Primer missing/oblong primer pocket
c. Shiny ring around the circumference of the case head
d. A small shiny circle on the case head (imprint of the ejector)
STOP!
Do NOT fire any more of that ammunition. You may be experiencing bullet setback upon feeding. This is caused by the bullet not being crimped properly, or an improperly cut feed ramp where the bullet is slamming into it upon feeding.
Take a close look; if any of the above signs are present, you are on the knife edge of disaster. Inspect it carefully before firing it again.
EDIT: I noted that you said you "cycled" rounds through it. If these were live rounds--and you did not fire the rifle--the rifling might have grabbed/engraved the bullet. Get some action proving dummies, and it might solve the problem.
Most AR bolts are finished with a step cut or peening to prevent assembling wrong. It's been milspec for decades. Cleaning a weapon in the dark means not being able to do it wrong, so it was fixed.
If the ammo was civilian grade non cannelure bullets, they can set back when cycled by a self loading gun. Another finesse point to some, mandatory for military use. If it's not cannelured and crimped, sets back, and compresses the powder, high pressures from rapid burning of the powder charge will prove the chamber can take the load - or not. Exploding guns are not well liked in combat, but cheap ammo is liked on civilian ranges, pay as little as you can accept the risk. Kabooms do happen, albeit rarely.
If the ammo was civilian grade non cannelure bullets, they can set back when cycled by a self loading gun. Another finesse point to some, mandatory for military use. If it's not cannelured and crimped, sets back, and compresses the powder, high pressures from rapid burning of the powder charge will prove the chamber can take the load - or not. Exploding guns are not well liked in combat, but cheap ammo is liked on civilian ranges, pay as little as you can accept the risk. Kabooms do happen, albeit rarely.
thesheepdog
New member
Just open the receiver; place a wooden or plastic rod in the cut-out of the bolt; take a hammer to the rod and wack the snot out of it.
It happens on my Grendel AR sometimes (more specifically when testing COL for reloads).
It happens on my Grendel AR sometimes (more specifically when testing COL for reloads).
Technosavant
New member
Another expedient (so you aren't sticking stuff down the barrel with a live round potentially in there, which can end messily) is to pull on the charging handle while smacking the buttstock into a hard surface.