I used the proper TA31 when building my M16A4 clone. I like everything about it, except the short eye relief. (Well, almost everything... ironically I have just located some foreign matter in it after a year of owning it, so its going back to get cleaned out... I understand this is very rare though) So, I'm still thinking about an optical sight for the XCR, and am considering a TA11F.
A couple things give me pause; that being it was designed for a 20" barrel, and an AR15 height over bore. How far off would this put me with it on the XCR? How about when switching calibers?
Bullet weight and velocity make sense, but I'm having a hard time visualizing how the height over bore really has a big effect on the recticle pattern.
A couple things give me pause; that being it was designed for a 20" barrel, and an AR15 height over bore. How far off would this put me with it on the XCR? How about when switching calibers?
Bullet weight and velocity make sense, but I'm having a hard time visualizing how the height over bore really has a big effect on the recticle pattern.