This is taken from TLR website and might help:
TLR1072-Front Pivot, Aluminum: adds 7 grams of weight over the stock plastic pivot providing a smoother off-power feel and increased on-power steering.
If you are interested in adding even more weight to the front of your 22 the (TLR1049)25 degree brass kick shim adds 8.8 grams of weight and the (TLR1048) 20 degree brass kick shim adds 16grams of weight.
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Mr F.Chimp
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