Depends, want to build a CQBR or a Mk18? For a CQBR, I would say get a CQD sling end plate (G&P makes one w/o trades for cheap), replace the A2 grip with an A1, 10,3'' barrel. For an Mk18, the regular end plate is possible, as well as the 10,5 incher but you would need to get an LMT marked rear sight. Older CQBR's had the Crane version rear sight w/o trades or am I mixing with the Mk.18? Anyways, all that to say that your gun is fine like it is, unless you REALLY want to make a SEAL or VBSS impression.
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