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Brand New LM4 slide not locking back?


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#1 Frankie9011

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Posted 30 April 2013 - 03:15 PM

Literally opened it less than an hour ago, charged it with green gas and loaded it with .25 kwa bbs. Slide didn't catch when it was out of bbs, just kept drying firing. What gives?

#2 General Pickle

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Posted 30 April 2013 - 08:14 PM

try holding the magazine while you fire the last shot, I found that with one of the mags I borrowed from a teammate the mag wasn't holding high enough in the gun so it couldn't engage the bolt catch every time. I've heard that you can bend the bolt catch level down slightly to decrease this from happening but I haven't tried it yet. If you decide to do that then be very careful, use a heat gun on  the part ALONE outside of the gun, I'm still trying to figure out the best way to actually bend it without marring the hell out of it. Another less involved way of solving this problem would be to check if your gas can is full. Do the shots kinda struggle to cycle or is it solid and crisp?

#3 Frankie9011

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Posted 30 April 2013 - 08:21 PM

The shots feel really solid and crisp. I've noticed the mag is getting really cold (i live in florida, 80+ degrees outside) and specifically doesn't like to catch the bolt when its cold. On semi, it locks about 90% of the time. Full auto? No chance. It'll dry fire to its heart's content. Could I have gotten a faulty mag?

#4 Rockhound117

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Posted 30 April 2013 - 09:34 PM

Split the receiver and insert the empty mag. Make sure the bolt stop is functioning properly and rises as far as it will go. Also, check the overall functionality. Does it lock back when you pull the charging handle back with an empty mag inserted? Does the bolt carrier travel all the way back? There is a chance you might have to modify the bolt stop if it doesn't rise completely. You'll know because you'll be able to pull it higher even after you insert the mag into to the split lower receiver. It could possibly be an issue with the mag, though it'd be strange for it to occur because of its temperature. Is the follower in good shape? Or the lever that actually pushes the bolt stop up? Hell, it might just need to be cleaned and lubed. Friction can be a cruel mistress.

#5 Frankie9011

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Posted 30 April 2013 - 11:51 PM

Mag seems to be in good shape.. It locks back manually and the carrier travels all the way back is well. I'll split the receiver and check all that stuff out and update you guys soon.

#6 R_King91303

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Posted 01 May 2013 - 03:30 PM

Sounds like something doesn't like the recoil if it's primarily a full auto issue, so I'm wondering if this could be a spring issue with the bolt (plunger) release.


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#7 -wigs-

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Posted 02 May 2013 - 06:15 PM

To bend the arm you don't need heat, get a small adjustable wrench and a pair of plyers. Adjustable wrench snugged tightly on the arm and grab the large "face" of the bolt catch body with plyers to hold it then bend the arm. Takes two seconds. Before you do that though split the revivers like said and take the top off the mag and put a drop of silicone oil on the arm that engages the bolt catch. One of my mags didn't lock back, just turned out the lever was getting stuck. Eventually has happened to all my mags. Just gets dirty with use and sticks.

Edited by -wigs-, 02 May 2013 - 06:20 PM.





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