No crimp. Both of my Heavy Barrel AR-15's have Leupold VXR 4x12's on them. All of my other AR's have Eotech's.
"Allways speak the truth and you will never have to remember what you said before..." Sam Houston
Texans, "We say Grace, We Say Mam, If You Don't Like it, We Don't Give a Damn!"
~Molɔ̀ːn Labé Skýla~
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