The E-23 rubber o-ring acts as an inner barrel stabilizer on all LM4 PTR GBB rifles, as well as the entire AKG Series. It appears on respective diagrams as LM4 PTR part 44-0, and AKG part 63.
The F-18 spring fits multiple KWA models, and appears on respective diagrams as M9 1st Gen part 52, M9 PTP and M9 Tactical PTP part 74 and M93R II NS2 part 103.
This metal flash hider spring fits all KM4, RM4, LM4, and AKG rifles, and fits under the flash hider washer to keep tension on the washer and flash hider. It appears on respective diagrams as KM4 part 165, LM4 part 208, and AKG part 381.
The F-6 firing pin spring fits multiple KWA GBB pistols, and appears on respective diagrams as M1911 MK Series and M1911A1 NS2 part 73, discontinued...
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