If you get the version without the recoil reducer it should not be an issue, the barrel length should be the same.
That is 100% incorrect.Once the bullet leaves the actual barrel and enters the CR attachment,the expanding gasesare released topass around the bulletand no longerprovide a driving force onthe bullet.If you look at a CR attachment you will better understand this since the inside diameter of the CR is larger than that of the bullet or the barrel.