It’s a start, but the proportions are all wrong for that pistol mount ……Quick test fit for photos. It looks the dogs bollocks.
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….. though in a slightly more serious manner, I have actually played a pistol with a 13ci cylinder attached
It worked, but could not be held outstretched on target for long …..View attachment 155298
Running a pistol challenge and needing more pistols in the team inventory gave me the “justification” to “invest” in a twin, which then simplified to going akimbo and managing reloads & CO2 changes