Discontinued - POSEIDON Super Smooth Roller Bearing for WE G-Series GBB Airsoft

It got here quick and it works perfectly.

It fits Army Armament R17 amd it is must have upgrade. Pistol is cycling much better and smoother.

Used it on an aap with a broken hammer, Cheap fix and works very well

9 mm was recommended for FULL AUTO series, but 8mm works as well.