I did the same to a new Citadel a while back, modified a new Sonic muzzle forward can and made arear extension for it. After cutting down the mage tube it holds 5 rounds (357 Mag). Takes a bit to do but ok when you have the kit.
Still new, only put 10 or so rounds through it, anyone want it $1600 (plus $100 for the red dot/laser)
Cheers
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