It uses a different threaded rod (double helix, timed for 50 cal)knob base, and knob. The only real difference between 50 cal scopes and 30 cal are the elevation assemblies that start from the fine tune lever on up. The first 30 cal to 50 cal Unertl conversions still utilized the leaf spring. 30 cal for use on an M40A1?No, that just means it has had it's leaf springs replaced with a tougher, coil spring (that sits in the manhole cover) to support a greater range of elevation adjustment required for the 50 cal elevation settings. 50 cal." I take it the scope would need modification to bring it back to. ![]() ![]() When the auction description states "Does have the USO elevation modification to convert it from the.
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