I have had Mod 41's with multiple barrels bought as different times and never had a problem mounting them. I know of others that have two barrels one with irons ant the other with red dot and switch back and forth.
One of the lightest options is the heads up type red dots (or green dots), such as the Burris FastFire, Vortex, Leupold, Doctor etc. especially if you are still shooting Bullseye (one handed) competition.
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H Richard
SWCA1967 SWHF244
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