I have, which is why I commented. It made the rifle too front-heavy, especially for 3-gun. The polymer rear just doesn't balance out the weight of the gun very well.
Well there you have it, figured the front heaviness would help reduce muzzle climb, had an ACR which was quite front heavy compared to an AR and it had significantly less muzzle climb; but then again the whole rifle was quite a bit heavier than an AR.
Sgt. of Marines, 5th Award Expert Rifle, 237/250
Expert Pistol, 382/400. D Co, 4th CEB, Engineers UP!!
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OEF 2011 Sangin, Afg. Molon Labe