These WIX 24003, 24744, / NAPA 4003, 4744 style fixed mounts have (1 7/8"-16 O.D. thread) by (14mm x 1 left hand muzzle thread). They are made form 416 Stainless Steel, use the same o-rings and are much more corrosion resistant and durable than the original aluminum caps. Weight 6.2oz. (176grams).
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Posted by Colin DuPee on May 21st 2020
It's a very robust design, which would be fine in aluminum. In steel, it is my opinion that it's too heavy.
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