Ramp polishing

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Cardboard_killer
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Ramp polishing

Post by Cardboard_killer » Mon Aug 15, 2016 5:57 am

I'm working on my second build, a 7.62x39 carbine. I got a KAK melonite treated barrel. I was thinking on polishing the ramps (M4) before assembling the upper. The ramps aren't particularly rough, but aren't particularly smooth either. I'd rather polish now than put it together and find I need to take it apart to polish them. Anyone have opinions/tips?
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Rentprop1
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Re: Ramp polishing

Post by Rentprop1 » Mon Aug 15, 2016 2:28 pm

WOT = waste of time
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Re: Ramp polishing

Post by LastRites » Mon Aug 15, 2016 4:41 pm

BNTL= Better now than later

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870Mike
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Re: Ramp polishing

Post by 870Mike » Mon Aug 15, 2016 9:37 pm

YMMV = Your Mileage May Vary (Probably won't notice a difference).
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better2have&notneed
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Re: Ramp polishing

Post by better2have&notneed » Tue Aug 16, 2016 9:51 am

TSTB = the smoother the better

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Re: Ramp polishing

Post by TC6969 » Tue Aug 16, 2016 10:40 am

The best method I've found is to slide little brass cylinders in and out of the chamber.
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Re: Ramp polishing

Post by Cardboard_killer » Tue Aug 16, 2016 11:22 am

Everything I've seen says that 762x39 builds are finicky. One article suggests completely grinding down the ridge between the ramps, a style that Colt did with their 762x39 barrels back when they were making them.
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Re: Ramp polishing

Post by LastRites » Tue Aug 16, 2016 3:50 pm

I would likely be inclined to test fit barrel first then polish any sharp edges prior to install, nothing radical. Build it and see how it shoots. If the extension is melonited/nitrided, grinding on the center post is going to be a bit<h as may you know that treatment increases the hardness of the metal.

The mags are generally the real issue most of the time and it seems C Products Defense has ironed out the issues of bad feeding from what I gather.

The other reoccurring issue are bolts with the extractors breaking. Oh and then there is that the barrels are usually over gassed so be prepared to drop a H2 or H3 buffer in it with a stiff spring or run an adjustable gas block.

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