Replacement O Ring for SMW Weihrauch HW100 Magazines (and OEM 177 magazine)

Please select the correct O Ring for your magazine:

SMW Engineering single ring HW100 magazines use BS124 O Rings which are 31.42mm inner diameter and 36.66mm outer (2.62 cross section diameter). These are the same o rings used in OEM 177 magazines.

SMW Engineering double ring magazines use 32x2mm O Rings.

(OEM 177 magazines also use 32x2mm O Rings)

The price below is per single o ring. Note that post will be added at checkout.