Retro Arms CNC Hop Up Chamber AK receiver sets This O ring has superior

This O ring has superior properties to the standard material O rings that come with most piston heads

The tension of the spring can be adjusted to further fine tune your results

rearview mirrors

Pack of SHS Shims

Retro Arms CNC Hop Up Chamber AK receiver sets This O ring has superiorThis is the newest Hop Chanber for AK from Retro Arms They changed their drill depth allowing the use of 20. 1 mm nozzles This Precision Hop Chamber will increase accuracy and consistency for your AK AEG platform Included 1pcs Hop Up chamber for AK (anodized, made from aircraft dural EN AW 7075) 1pcs Setting lever (anodized, made from aircraft dural EN AW 7075) 1pcs Pushing lever with cut for common spacers(anodized, made from aircraft dural EN AW