KWA LM4 (PTS Mega Arms MKM) Aug 18, 2016 14:35:44 GMT
Post by rixon on Aug 18, 2016 14:35:44 GMT
Hey everyone, thought id make a post about some LM4 modifications/fixes.
For double feeding:
More than likely you have a worn nozzle o-ring. the best replacement solution is a Danco #10. They can be found at any Menards or Home Depot. Another cause to double feeding is the hop up actually being loose and moving very slightly on the inner barrel. Newer Lm4 models have a c-clip behind the hop up, so if you have a 2015+ LM$ (will have a 1-piece upper reciever) disregard. For this fix you can either do a quick fix by wrapping electrical tape behind the hop up, or use a dremel and carefully cut a groove in the barrel so you can use a c-clip.
Shooting too hot?
This is a common problem for those of you who live in hot areas. I strongly discourage the n-pas as it never seems to be consistent and is a pain to adjust. I would highly reccomend the dangerworx valve. If that isnt an option, you can cut a coil or two off the rocket valve spring. -little by little. cut, chrono, cut chrono. little by little.
Cold weather LM4 users. There are several things you can do to improve the efficiency of your lm4 in cold weather. I live in minnesota, here are some things i do to my rifle:
Danco #10 oring on the nozzle
replace buffer spring with a wa-spec spring made for use with duster gas.
Use Map gas (propene). be careful when using map gas. when filling magazines in cold weather, make sure that you purge you mags before going home and storing your mags where its warm. gas expands with heat so when you fill a mag when its cold and then the mag gets hot, it can bloat. so be aware of that.
if you want to take it a step further, you can "swiss cheese" your bolt carrier.
there are two safe ways to increase recoil on an lm4. one of them is to use an A2 (m16 buffer). this buffer will be a bit too long. you will need to cut it down to size.
The easiest, is to use a standard carbine buffer. A carbine buffer will be too short so you will need to make a spacer. a wine cork works great. you can also use some nickels and glue them together. DO NOT use quarters, they will get stuck in your buffer tube!! place your stock plastic buffer next to your carbine buffer, make the plug/spacer the size it needs to be so they are the same length. take the buffer spring out of your buffer tube and insert the plug, then the spring, then your carbine buffer. your done!
If anyone has any lm4 problems/questions, post them up!