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GunTuff 1/2" Thread Protector - Alloy High quality blued thread protector for all popular silencer adaptors and barrels with a 1/2" UNF male thread. Approx. 1cm long - the photo is much larger than the actual item! 1/2" UNF = 20 TPI (threads per inch), this model won't suit rifles with 1/2" UNEF (28 TPI) threads. ..
SAK Sound Moderator / Black Advanced sound moderators for air weapons and for rim-fire rifles. Standard 1/2"x20 UNF thread or 1/2"x28 UNEF thread Low maintenance No springs or plastic parts Size: 140 mm long x 35 mm diameter Weight: 160 grams Corrosion-resistant, long-lasting product ..