I'm in the process of going from a DD Lite Rail on my BCM barreled upper to a Troy Alpha. My smith removed the original A2 front sight/gas block and attempted to install the .750 Troy low-pro gas block I provided. Winds up that the barrel is just a tad too big for it, as it mikes to .7556.
Anyone know a source for one that size, or does that require a clamping type gas block?
Thanks,
Pat


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