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GBB has good sealing, operates smoothly but doesn't cycle fully -> Hammer Spring weardown after two months? U wot Guarder?!?
Is it a glock? If the hammer spring gets installed incorrectly, it strains the spring leading to premature weardown. SAPH Glock 17 hammer spring should do the trick!
Also o-rings are fine.
What's your recoil spring?