I personally prefer the KWA LM4 GBBR over the KA m4 due to how and what is built out of. My king arms has only has had a few mags run thought it and a very cheap piece of plastic broke that is required for the bolt to function. The kwa is made of metal and will take a lot more abuse. Beside all around it seems To be just constructed better, everything is tighter and a lot of RS stuff fits it, if your into the stuff other wise you can use you can use airsoft parts except for the grips which are made for RS grip. If you came by SoGo this weekend for the night game I'll have both of the there can can show you the differences between them. If you wanting it for CQB play you'll need the KA because it can be DG easy, don't get me wrong it's a good gun but you'll need to mod it alittle to make it useable over a long period of time. Which is what I will we doing to mine when I get my new bolt in at SoGo. Kwa 379 fps out of box green gas no DG available KA 380-420 with DG in box it drops around 290-315 .25g used in both shot tests
