Posted: 7/19/2009 5:57:10 PM EDT
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I have a 10.5" A4 5.56 pistol upper I ordered in January and am running it on a SBR lower. When ordering, the barrel twist was advertised as 1/7. 3 digit code stamped on the barrel is 225 which translates to 10.5" 1/9. Anyone been able to confirm their shorty upper is in fact 1/7 and not 1/9. anyone know how long RR has been using the 1/7 in their pistol uppers??
thanks for all help and insight in advance! |