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How to round bolt?

Kwa lm4 bolt bolt catch

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#1 FlubberDucky

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Posted 11 March 2013 - 06:03 PM

I was wondering how to exactly round the bolt cause mine seems to have completely stopped locking to the rear and it also seems pretty damn rounded as well. Please post a tutorial or something for noobs like me! I will post some pics for you guys!

http://s1337.beta.ph...html?sort=3&o=3
http://s1337.beta.ph...html?sort=3&o=2
http://s1337.beta.ph...html?sort=3&o=1
http://s1337.beta.ph...html?sort=3&o=0

Thanks!

#2 pa1ntbru5h

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Posted 11 March 2013 - 06:44 PM

you actually would want to "Sharpen" the bolt.. not round it.
The round edges is what causes the bolt to slip off the bolt catch.
So you would want to file the corners back to a 90 deg angle as best you can.

#3 akiraspeedstar

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Posted 11 March 2013 - 07:27 PM

Yeah seems both the bolt stop and the bolt carrier is rounded, you need to file those flat and like pa1ntbru5h mentioned, square it. The positive of being forced to do this is that you're actually increasing the amount of time the bolt stop has to properly rise.

#4 Theshank

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Posted 11 March 2013 - 07:54 PM

Are the other pieces possibly the firing pin that frequently breaks? Just curious.

#5 akiraspeedstar

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Posted 12 March 2013 - 06:31 AM

The firing pin can break, my unit has yet to though I know some who have and I heard it isn't good, that's the impression that I get. *knock on wood*

#6 BENboBEN

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Posted 12 March 2013 - 08:49 AM

My firing pin broke. One of the rings that the pin goes through snapped in half. I've been running it like that for well over three months now because I'm too lazy to get parts. I havent been using it too much because of the cold so I can't say its fine, but I guess I can also say its held up fine for some use in below freezing which can't be helpful.

#7 okay47

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Posted 14 March 2013 - 12:28 PM

View Postakiraspeedstar, on 12 March 2013 - 06:31 AM, said:

The firing pin can break, my unit has yet to though I know some who have and I heard it isn't good, that's the impression that I get. *knock on wood*
Just realized, Mighty Mighty Bosstones?

#8 akiraspeedstar

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Posted 14 March 2013 - 01:20 PM

View Postokay47, on 14 March 2013 - 12:28 PM, said:


Just realized, Mighty Mighty Bosstones?

Haha yeah, I was typing my reply and started wondering why it sounded familiar. I then finished it off and wondered if anyone would catch it.

#9 gcw360

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Posted 14 March 2013 - 05:01 PM

Saw them live in Pittsburgh....very good!

#10 FlubberDucky

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Posted 16 March 2013 - 02:39 PM

So could somebody please tell me exactly what i need to shave down and exactly how to do it so i can get my lm4 functioning properly again? Pics would be great. Thanks

#11 ky2970

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Posted 17 March 2013 - 02:14 AM

View PostFlubberDucky, on 16 March 2013 - 02:39 PM, said:

So could somebody please tell me exactly what i need to shave down and exactly how to do it so i can get my lm4 functioning properly again? Pics would be great. Thanks

There are a LOT of threads on this already. Check akira's youtube channel: GeckoActual and BoobieM4H's channel

#12 FlubberDucky

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Posted 21 March 2013 - 06:29 PM

Alright so today i took a dremel and started sanding down that little ledge where the bolt carrier stops on the bolt catch. Thats ALL i sanded down, NOTHING else. It seemed nicely done, perfecly flat and pretty good and it looked brand new, so i tried it out. It worked well, not so great like it should it was still a light push, but with the mag it was fine. I literally just locked it back and sent it home 3 TIMES ONLY. I took it out to inspect it and BAM. The little corner right where it was rounded in my last pics is already started to crap out and get all cut and rounded again. Im scared to do this again and i just dont wanna use my rifle while its like this. Btw i have the modified A2 buffer installed, so i dont know if the added weight that the bolt is slamming in with makes a big difference. I will post some pics so you guys could see what im talking about and it would be great if you guys could help :D im thinking of doing the bolt stop mod, but im not very good at things like that, and im hoping to soon purchase the new version of the bolt stop allowing the full functionality and all that with the spring and everything. I dont want to get another spring. I also think kwa just messed up on this bolt stop function. They should have made it like the mod in the first place cause after a while EVERYONE'S craps out...help me out guys! Thanks!

http://s1337.photobu...html?sort=3&o=3
http://s1337.photobu...html?sort=3&o=2
http://s1337.photobu...html?sort=3&o=1
http://s1337.photobu...html?sort=3&o=0


#13 akiraspeedstar

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Posted 21 March 2013 - 06:46 PM

It's not the A2 buffer weight as the Angrygun kit didn't round my bolt carrier or bolt stop. So you manually locked back the bolt and released it and the bolt carrier rounded?

#14 FlubberDucky

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Posted 22 March 2013 - 01:00 PM

View Postakiraspeedstar, on 21 March 2013 - 06:46 PM, said:

It's not the A2 buffer weight as the Angrygun kit didn't round my bolt carrier or bolt stop. So you manually locked back the bolt and released it and the bolt carrier rounded?
Yea pretty much! Butmits not like it actually ROUNDED. Its like....i dont know...getting that little cut where the rounding actually starts. Like in the pictures..can you see it? The bottom corner of where the bolt rounds is already getting "cut" or something like that. I have no idea what is the problem and i sure as hell dont want to use my lm4 like this

View Postakiraspeedstar, on 21 March 2013 - 06:46 PM, said:

It's not the A2 buffer weight as the Angrygun kit didn't round my bolt carrier or bolt stop. So you manually locked back the bolt and released it and the bolt carrier rounded?
Yea pretty much! Butmits not like it actually ROUNDED. Its like....i dont know...getting that little cut where the rounding actually starts. Like in the pictures..can you see it? The bottom corner of where the bolt rounds is already getting "cut" or something like that. I have no idea what is the problem and i sure as hell dont want to use my lm4 like this

#15 SnowboardeR1298

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Posted 23 April 2013 - 08:45 PM

View PostFlubberDucky, on 21 March 2013 - 06:29 PM, said:

Alright so today i took a dremel and started sanding down that little ledge where the bolt carrier stops on the bolt catch. Thats ALL i sanded down, NOTHING else. It seemed nicely done, perfecly flat and pretty good and it looked brand new, so i tried it out. It worked well, not so great like it should it was still a light push, but with the mag it was fine. I literally just locked it back and sent it home 3 TIMES ONLY. I took it out to inspect it and BAM. The little corner right where it was rounded in my last pics is already started to crap out and get all cut and rounded again. Im scared to do this again and i just dont wanna use my rifle while its like this. Btw i have the modified A2 buffer installed, so i dont know if the added weight that the bolt is slamming in with makes a big difference. I will post some pics so you guys could see what im talking about and it would be great if you guys could help :D im thinking of doing the bolt stop mod, but im not very good at things like that, and im hoping to soon purchase the new version of the bolt stop allowing the full functionality and all that with the spring and everything. I dont want to get another spring. I also think kwa just messed up on this bolt stop function. They should have made it like the mod in the first place cause after a while EVERYONE'S craps out...help me out guys! Thanks!

http://s1337.photobu...html?sort=3&o=3
http://s1337.photobu...html?sort=3&o=2
http://s1337.photobu...html?sort=3&o=1
http://s1337.photobu...html?sort=3&o=0

Have they fixed this bolt catch in the newer models? (new production models since initial release)





Also tagged with one or more of these keywords: Kwa, lm4, bolt, bolt catch

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