This kit is for HW100 & HW101 (all calibres). WEIHRAUCH (also known as BEEMAN) HW100 / hw 100. Fits all HW100's (old and new). Using PTFE tape can cause internal overhangs of loose tape to constrict a joint, or slough off and form a foreign body that could jam a valve seal (the shredded bits of tape can get stuck in the regulator) - when this happens a regulator strip down is often necessary.
eBay