EMG SAI Licensed Steel Bolt Carrier for M4 Airsoft GBB Rifles by RA-Tech (Model: GHK)

"This bolt is gorgeous. it's solid steel. my aluminum nozzle doesn't cause damage to this bolt like it did with the stock aluminum bolt. also, the bolt catch functions VERY well and doesn't seem to be taking much wear because both the bolt catch and bolt are steel.
I love it. I will be installing one of these into my next WE Tech GBBR

"Drop in fit. Beautifuly made, cycles great bangs HARD! Love it. Highly recommend!

"Just got the bolt today. Pretty happy how it looks and feel. Got it to fit in my WE 888c (HK 416c). The thing looks flawless. At first I couldn't charge the handle back, but after a little fiddling, it did the trick. Make sure to lube it thoroughly, especially at the rear end of the bolt.

Only thing I complain is the bolt catch doesn't always engage like it used to anymore, not sure why. The bolt catch might need some trimming perhaps. It's pretty stiff after installing the bolt. You will notice this right after you install the bolt, as you might not even charge the handle back, or close the upper receiver. This happens to both the stock and the included new bolt catch. But like I said, fiddle with it a bit then everything will fall in place.

Also a minor aesthetic detail is the laser etched SAI logo has a little burnt outline around it, not as crisp as in the photos. But it's barely visible. Still looks neat regardless.

"Bolt fit and worked great. Had the "gas port" section snap off. Works without it. Looks amazing. You can find replacements for the bolts that may break off the gas port. Color has stayed after thousands and thousands of shots.

"Love the bolt itself, looks absolutely gorgeous with a gold charging handle as well that's made by angel customs. The bolt catch needs some diy done to it though. You need to shave off some material off the bolt catch that contacts the receiver a little bit since it doesn't work stock.

"Drop in part with no modifications required. Accepts standard loading nozzles. It has an excellent build quality, hasn't deformed or been marred at all after thousand's of shots. The only problems are that it is heavier than a standard BCG for a WE M4, because it is actually steel, and therefore slows the cycling slightly and makes the gun overall a little less gas efficient. And while the finish is of a great quality, it looks fantastic and is really durable, i think it's a little coarser than the standard bolt which i think is also (though not much at all) slowing down the cyclic rate. So while this is a great looking and still functional part, I'd recommend at the very least, using CO2 mags for this, to ensure 100% reliability.