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Lock back with rounds in mag


MaddHatter

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I recently added a adjustable gas block, low weight bcg, and taccom buffer. I got the bolt to lock back after last round at range but during a comp today the bolt would lock back every 5 rounds or so. Do I just need to adjust further? Start over? Suggestions are appreciated. 

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Is the bolt catch spring strong enough to keep the bolt catch out of the way until the follower on the mag engages it? This can lead to premature locking back.

 

Now it could need more gas if the bolt is having difficulty stripping a round from the mag (which is a different scenario).

 

Have you tried multiple times to see if it will lock back after a single round in the magazine? This will determine if it is undergassed or not. This is the FIRST test to do.

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55 minutes ago, mic2377 said:

Is the bolt catch spring strong enough to keep the bolt catch out of the way until the follower on the mag engages it? This can lead to premature locking back.

 

Now it could need more gas if the bolt is having difficulty stripping a round from the mag (which is a different scenario).

 

Have you tried multiple times to see if it will lock back after a single round in the magazine? This will determine if it is undergassed or not. This is the FIRST test to do.

 

Thanks for the response.  I fired 1 round to empty mage around 5 times and was able to lock back every time.  I think I will just try it with more rounds to empty mag and  adjust.  Just wasn't sure if I was missing something else.

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You need to identify if the bolt is locking back as in the bolt catch is engaging OR the bolt is flailing to strip a round out of the magazine and is stuck back.  

 

If you pull the magazine out and the bolt goes home, your bolt is stuck back.  

 

If you remove the magazine and the bolt remains locked to the rear, your bolt is locking back.  

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4 hours ago, dauntedfuture said:

You need to identify if the bolt is locking back as in the bolt catch is engaging OR the bolt is flailing to strip a round out of the magazine and is stuck back.  

 

If you pull the magazine out and the bolt goes home, your bolt is stuck back.  

 

If you remove the magazine and the bolt remains locked to the rear, your bolt is locking back.  

 

Good info. Thanks for the help. 

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4 hours ago, dauntedfuture said:

You need to identify if the bolt is locking back as in the bolt catch is engaging OR the bolt is flailing to strip a round out of the magazine and is stuck back.  

 

If you pull the magazine out and the bolt goes home, your bolt is stuck back.  

 

If you remove the magazine and the bolt remains locked to the rear, your bolt is locking back.  

 

So if it is just the bolt is stuck back what would be remedy?

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if your bolt is sticking to the rear:

- The first place to always check are the magazines, ammunition and lubrication.  If your magazines are gummed up or the ammo is a little dirty, the bolt can have a hard time stripping a round out of the magazine.  

 

- Provided the all else is good, you really need to take a look at the malfunction in action to determine where the bolt is in relation to the ammunition.  If the bolt is almost all the way back and it's "stuck" about 1/4-1/2" forward from the base of the case it's likely your system needs a little more energy to return the bolt all the way to the rear of the magazine IOT pick up a fresh round of ammo.  Again, improper lube, under power ammo or bad magazines can contribute to this.  Provided those are OK, open up your gas block a little more and see if that fixes the problem.  

 

 

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