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Customizing a firearm is nice, if done correctly. I don't know how a comp would make a pistol better for target shooting. If anything else, it could make it worse.
I have found that (when on the range) if I load 5 rounds in a mag, I shoot better and I don't waste as much ammo. I am "forced" to take a break to reload mags and have a chance to see where I am putting rounds on the paper. Keeping track of 18 +1 rounds is too confusing for this old head.
One of the best things I have found that have made my handguns better for target shooting is practice. The more I practice, the more the pistol "breaks in" and seems to work better.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)