Quote:
Originally Posted by Brett248Vista
JP Enterprises makes a bolt on A2 front sight, it's expensive ($119) but it clamps on. You will need to have a shim machined to fit between the barrel and the sight. The 15-22 barrel is .670(ish) and the A2 sight post is .750 ID.
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There are similar ones that have an integral folding front sight as well, not sure about them being clamp on though.
You can also get a normal gas block, it just needs to be high to use a sight that would normally go on the rails.