Home > Britannia Moderators Britannia Moderator .22 Rimfire and Air Rifle Stock Status: In Stock Brand: Britannia Moderator Code: BM-22LR £39.95 Send to a friend Print Description Diameter 22mm Length 92mm Weighs 26 grams Thread 1/2" UNF Designed for .22 Rimfire and air rifles. Supplied un-proofed.