A&K M24 sniper. Works great. The hop is pretty sensitive on this thing. The slightest adjustment makes a big difference. Metal piston and spring guide. The 2nd picture shows where I put in a substitute bolt because the hole the bolt goes into chipped a little bit and I needed a bigger one to fit. My dremel wasn’t working at the time and I jus haven’t cut it down to size. Over all a solid rifle. Comes with 3 mags but scope is not included. Hit me up with any questions you may have. Only PayPal accepted and you pay shipping. Maybe interested in trades depending on whatcha got. Thanks for looking. Shipping can be expensive if I have to ship to California judging by my past experiences