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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Barrel and upper prep
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<blockquote data-quote="Darryle" data-source="post: 2960057" data-attributes="member: 109917"><p>I quit all of that and started using BCM uppers that have to be thermal fit.</p><p></p><p>Barrel in the freezer for 24hrs or more, heat the receiver up, apply a very thin film of high temp grease to the receiver bore and work fast getting the two together. I had a couple thread protectors made from a 1" diameter piece of pipe, one for 1/2-28 and one for 5/8-24 in case I need to seat the barrel extension with a whack. </p><p></p><p>I was a 620 guy for years, not anymore. Thermal fit and in some cases, custom fitted oversized barrel extensions. </p><p></p><p>The thing with the receiver face lap, you are using lapping compound, how much wear is happening to the lapping bar. I know that I took mine to work and had it CMMd on the face it had evidence of wear. </p><p></p><p>YMMV</p></blockquote><p></p>
[QUOTE="Darryle, post: 2960057, member: 109917"] I quit all of that and started using BCM uppers that have to be thermal fit. Barrel in the freezer for 24hrs or more, heat the receiver up, apply a very thin film of high temp grease to the receiver bore and work fast getting the two together. I had a couple thread protectors made from a 1" diameter piece of pipe, one for 1/2-28 and one for 5/8-24 in case I need to seat the barrel extension with a whack. I was a 620 guy for years, not anymore. Thermal fit and in some cases, custom fitted oversized barrel extensions. The thing with the receiver face lap, you are using lapping compound, how much wear is happening to the lapping bar. I know that I took mine to work and had it CMMd on the face it had evidence of wear. YMMV [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Barrel and upper prep
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