A quick look at the CXP MARS PDW9 S3 AEG from ICS Airsoft in this Gunfire Instant Video... "The CXP-MARS PDW9 S3 submachine gun replica was made of the highest quality materials. MLOK handguard and receiver were made of metal in CNC technology. A durable, adjustable stock, ergonomic pistol grip, 350BB’s hi-cap magazine, and folding sights were made of durable polymer. A characteristic element in this type of ICS replicas is the unique design of the bipartite gearbox. It enables the user to quickly replace the upper module and adjust the replica's power to the conditions on the field. The replica uses the MOSFET system that improves its parameters."