dedicated .22 AR: trigger can be pressed and hammer drops when bolt is locked back

[masakari]

I just discovered a potential problem with my .22LR AR. I am not sure if this is normal for all types of .22AR systems/conversions. Mine is made by CORE15, and it is a complete dedicated .22 upper.
So, when firing, the follower of the mag holds the bolt back. When you remove the mag, the bolt goes forward, then you reload and rack the charging handle. But when the bolt is locked back by the follower before the mag is dropped, the trigger can still be pulled, allowing the hammer to go forward with the bolt when the mag is dropped. I am fearful that this will cause wear on the chamber wall, as with dry firing of other .22s.
Does anyone have any insight on this? Are there any fixes?

[wahoo95]

I'm not understanding...How are you figuring this will cause wear on the chamber collar???

[masakari]

I'm not understanding...How are you figuring this will cause wear on the chamber collar???

the hammer goes forward with the bolt which causes the firing pin to impact the chamber

[wahoo95]

Ahhh...shouldn't be an issue since the firing pin should have an angled face which prevents it from striking the chamber. The firing pin doesn't come into contact with the collar at any point...the bolt does.

"If you're gonna be dumb you gotta be tough"

[masakari]

Ahhh...shouldn't be an issue since the firing pin should have an angled face which prevents it from striking the chamber. The firing pin doesn't come into contact with the collar at any point...the bolt does.

"If you're gonna be dumb you gotta be tough"

Ok, so would that mean that its also ok to dry fire a .22AR too?
Thanks for the help on this!

[halfmoonclip]

I understand your concern about battering the mouth of the chamber, and, depending on how well engineered the firing pin is, it may or may not be a problem. I wouldn't routinely dryfire a .22rf, tho' an occasional snap shouldn't be an issue.

Bigger problem, and maybe I'm missing something, but the hammer should not be able to follow the bolt forward, trigger pulled or not. The disconnector ought to be capturing the hammer, just as it does when actually firing and the bolt runs forward with the next round.

What kind of .22AR are we talking about? It sounds like there isn't a bolt stop either; you say the magazine keeps the bolt to the rear.

In any case, unless I've totally misunderstood, you have a potential problem...has it fired okay with ammo?
Moon

[masakari]

I understand your concern about battering the mouth of the chamber, and, depending on how well engineered the firing pin is, it may or may not be a problem. I wouldn't routinely dryfire a .22rf, tho' an occasional snap shouldn't be an issue.

Bigger problem, and maybe I'm missing something, but the hammer should not be able to follow the bolt forward, trigger pulled or not. The disconnector ought to be capturing the hammer, just as it does when actually firing and the bolt runs forward with the next round.

What kind of .22AR are we talking about? It sounds like there isn't a bolt stop either; you say the magazine keeps the bolt to the rear.

In any case, unless I've totally misunderstood, you have a potential problem...has it fired okay with ammo?
Moon

Ys, the hammer follows the bolt if i press the trigger with the bolt to the rear, and that is the issue. It shouldnt be normal, but this is my first .22 AR so I wasnt sure if it was common.
The lower is spikes, the upper is Core15. And yes, there is no bolt hold open on these types of conversions, just the follower of the mag holds the bolt back. The mags are Black Dog Machine.
If I pull the bolt back slightly after it is locked back, it wont do it, so im thinking that for some reason, the mags just arent locking it back far enough to disengage the hammer.

[halfmoonclip]

I'm thinking it's more a matter that the hammer is not being pushed far enough to the rear to engage the sear or the disconnector.

I'd be talking to Tech Support from the MFG; at a bare minimum, you have the potential for an out of battery discharge or a run away gun.

How does it work if you are actually firing?

Moon

[masakari]

I'm thinking it's more a matter that the hammer is not being pushed far enough to the rear to engage the sear or the disconnector.

I'd be talking to Tech Support from the MFG; at a bare minimum, you have the potential for an out of battery discharge or a run away gun.

How does it work if you are actually firing?

Moon

The lower is fine. The issue is the when the bolt is HELD OPEN it isnt back far enough to cause the hammer to engage the sear/disconnect like it would on a regular 5.56 rifle. This is the root cause, and the only solution seems to be to get the mag follower to hold the bolt back a bit farther. I dont see how this is possible. I'm just curious if other people with .22 uppers have this same issue. It fires fine with live ammo, i had one light strike in 100 rounds through it so far. With 5.56, the lower has been through 5000 or so flawless rounds.

[halfmoonclip]

Okay, then you only have an issue when manually pulling the bolt to the rear until the mag follower catches it, when the mag is empty? You're saying it works fine when actually firing the gun?

Okay, try this....when manually operating the bolt with the charging handle, pull it fully to the rear before gently riding it forward until the follower stops it on an empty mag.

If the bolt is indeed 'cocking' the hammer sufficiently for the sear/disconnector to engage it, you have a non-problem. Just pull it all the way back with the charging handle, just as it apparently is flung all the way back when firing. When you charge the gun, do you pull the charging handle all the way back before releasing it? Why do it any differently on an empty mag?
Moon