the T-REX 9 is backwards compatible with all previous Classic Army Nemesis series AEG upper receivers

the HK Army Eject delivers reliable performance

and LiFePO4

Compatible with most M4 / M16 AEGs

G&G FAR 9 Rapid Folding PCC Airsoft AEG Rifle Macaron Blue desert eagle the T-REX 9 is backwardsFeatures Ultra lightweight polymer receivers Rapid folding design lets you fold both the stock and front end for an ultra compact package to transport, store, or even carry onto the field! M LOK handguard features continuous 1913 Picatinny 20mm RIS along the entire top length and M LOK slots on the 3, 6, and 9 o'clock positions Left side of the handguard features a sturdy locking piece to fix the front end in position when unfolded Upper receiver