This is a fully custom, ultra lightweight monk customs Polarstar F2 build that I made from the ground up. It is flat hopped with a pdi 6.01 tight bore steel barrel with a MAXX customs hopup on a MODIFY BATON flat hop bucking. There is a Picatinny rail for mounting a sight on the front of the upper reciever and one strip of Mlok rail on the bottom of the handguard, The Mlok can be rotated to go on any side of the barrel or to go on top where you can set up the monk customs fiber optic front sight, currently I have it set up on the bottom to accommodate mounting a flashlight. It is picky with mags but it works well with lancer systems LAWM mags It weighs only 2.6 pounds with a magazine and in total it is 22 inches from the stock to the end of the barrel Here is the full parts list Monk Customs Neo1 lime green/gold receivers Monk Customs 5 inch Green Carbon Outer Barrel Polarstar x Amped Green F2 engine Polarstar FCU Polarstar gearbox shims PDI 6.01 stainless steel barrel 141 mm Speed airsoft curved lightweight trigger PTS pistol grip AMPED airsoft IGL neon green RETRO ARMS CNC anodized gearbox MAXX Hopup ME PRO gold MODIFY Baton Flat Hop Bucking MAC Airsoft Drop stock Carbon