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Old July 18th, 2021, 01:24 PM #11
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Here's some pictures so you can see the differences.
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Old July 18th, 2021, 02:15 PM #12
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Nice illustrations.
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Old July 19th, 2021, 03:58 PM #13
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Thank you for all replies.This is a Pic of feedramps.I have to buy more magazines and think would be a good idea to have specific 300blk magazines to avoid mixed calibers.Iím using 30rds Gen 2 Pmags.
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Old July 19th, 2021, 04:11 PM #14
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From what I can see, ramps look okay. As long as there is no 'edge' between the ramps and the M-4 cuts, everything seems to line up well. Yeah try the new mags. I hope that solves the problem.
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Old July 21st, 2021, 10:58 PM #15
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I am not an AR tech but those ramps look awfully wide and ‘wallowed’ out. The siamesed section is deep. Pics of my 300 BO for comparison. Could be just perspective and shadowing in poster’s pic.
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Old July 22nd, 2021, 04:32 PM #16
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300 spec feedramps are a thing with some barrel extension ramps. can help with wider bullets, can jam up if there is a ridge where it meets the lower, or an edge on the barrel's chamber.
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Old July 22nd, 2021, 07:58 PM #17
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Old July 23rd, 2021, 07:33 AM #18
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First pic shows bad ramps. Notice the 'step' in the barrel extension? That ledge is a leading cause in poor feeding issues. Very fixable.

The next pic shows an okay example of feed ramps. No 'step' to catch/snag bullet points, however, a bit of polishing would go a long way to improve on this.

Third pic shows optimal ramps. They've been ground to perfectly blend with the 'M-4' cut upper receiver and then polished to a mirror finish.

A word of caution before taking on this project. Never grind the M-4 cuts in the upper receiver. It is NEVER necessary and removes the anodized surface from the aluminum. Always do your grinding and polishing while the barrel is not bolted to the upper. Go little by little, sliding the barrel into the upper frequently to check your progress. Once you are satisfied with the lineup, you can move on to the polishing phase.
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