AR15 jamming and feeding issues resolved - AR-15 magazine jams - polishing m4 feed ramps 

You can jump to 9:30 in the video to get to the actual resolution portion.

With every semi auto pistol I own as a routine procedure I always polish the feed ramp at the bare minimum. Sometimes I find it necessary to go a bit further with it by opening the ejection port depending on the gun can make a huge difference too. Porting and polishing can be done either by a competent gunsmith or do it yourself "IF" you feel comfortable with your own level of gunsmithing experience. Since my project build was to complete a .450 Bushmaster upper I had already opened up the ejection port of a standard Bushmaster stripped receiver and polished the feed ramp of my "New" .450 Bushmaster barrel.In my own experience more times often than not the magazine has been the culprit for most of the problems when trying to feed any hungry firearm but sometimes there can be multiple problems. Another consideration to always bear in mind is the ammo. Does your firearm like brass or even steel cased ammo and will it feed FMJ, SP or hollow points both with reliability ? Will it voraciously eat all of it flawlessly or be finicky eating only one type ? All 3 types of brass and steel cased can have a very small and slightly different OAL. Small differences between manufacturers can be all it takes to cause failing to fire or failing to feed problems. IMO all firearms should at a minimum eat FMJ ammo ultimately ejecting the casings at a 3'Oclock position from an AR-15. If not buffer weights and springs can be your problem too. I recently had a learning experience that the back of the bolt head lugs themselves were catching on the edge of the brass casing of the upcoming factory round in the magazine as the bolt slides back before the ejection of an already chambered round. It turns out the "Brand Spanking New" 3rd party Bolt I had purchased by itself separate from a carrier to change from my 5.56 bolt to install into my existing OEM carrier so I change up to the .450 Bushmaster had made it past their Quality Control leaving very sharp squared off corners on the back of the lugs. Couple this with the known stacking issues of using a 30 round G.I magazine modified with a single stack anti-tilt follower intended for use with .450 Bushmaster ammunition and it became apparent before ever firing the 1st live round I was going to have jamming problems just by manually cycling rounds through the weapon. The diagnosis was the hard part.The fix was unbelievably and amazingly simple. I used a small fine grade stone to slightly smooth off 2 of the corners of the bolt lugs ever so lightly taking care not to remove to much material by hand that can happen when using a Dremel tool. The second part was to pinch together the magazine at the top just a little bit with a pair of 420 channel locks.

As a 13 year veteran I am no stranger to an AR/M4/M16. I just recently built my own billet upper and lower 80% with a 14.5 1/7 twist barrel with free float rail and carbine length gas system. Today I took it to the range to fire it and it fired beautifully without even having to adjust my Magpul MBUS flips (hit 6" low and left of bulls eye at 50yards) however being I'm in California I was using 10 round mags (Kalifornia compliant) made by American Arms or some shit. Anyway with the bolt locked all the way back it would chamber the first round after hitting the bolt release, fire and eject the brass but would not feed the next round. Sometimes it would out a dent down the length of the brass as if the lug was riding down the too and the bolt would go forward on an empty chamber. Other times the round would get hung up on the ramps. Upon building the rifle I noticed that the upper feed ramps did not match the barrel ramps all that well and there is that noticeable ring or gap where the two align. I figured this was the problem, I also cycled rounds from a Magpul PMAG to be sure it wasn't just a mag related issue. I'm glad to know that my hunch was correct. I'll let you know how it goes.

Removing the protective anodizing from the frame will absolutely increase wear, and could even snag the point of a bullet. Cripe.

You removed the anodizing from the receiver? That's not good.

I love the ergonomics of the A.R. 15. But there's always some little something that can cause a catastrophic problem at the worst time. A Arsenal AK is my go to gun now. I have not cleaned in months to see it is will have issues 1,500 round later I'm still waiting.

Spit it out

Colt magazines are actually made by Okay, and carry the 33710 CAGE Code stamped on the mag body. Only difference between Colt and Okay mags are the floor plates. If you wish to pay a premium for a pony on the floorplate, well... Thermold mags. I have not had good results from Thermolds. They have a number of issues, including not plugging in all the way on some receivers. On the other hand, there are very few USGI type mags that won't work well, particularly with newer anti-tilt followers such as Magpul, Duramag, or even the GI "green followers". The Thermold mags sometimes, with some receivers, will not go in all the way due to the molded shoulder that hits the bottom of the mag well. Also, the notch at the back of the mag where the bolt catch finger goes into the mag and is lifted by follower, the notch is too small and prevents the mag from fully inserting.

My upper reviver did not even have M4 feed ramp and my barrel did, so I made my own and polished them. all my jam issues gone now.

I built a rifle for 450$.. like a month ago. It has a few quirks but functions ok I need to polish out the chamber live rounds tend to get stuck some times, I've gone through about 3 or 4 charging handles before I found out what was causing the wear. I'll have to polish out the ramps too it likes to Mar up rounds on the right ramp.

Is that a BRB TACTICAL upper? Because if it is I am having the same issues.

Is it a pretty normal thing for the lugs on the bolt to scratch up the cases in the magazine when it travels back?

Looks like very good work!

Did you check your head space?

There is a double feed issue with my rifle As far as you know, this is Magazine problem or has some other problem please reply me

How much did you polish the feed ramps! My soft point ammo is what I am having problems with! I have an AR15 chambered in 7.62x39

I'm looking through the guy who shot at Buffalo's supermarket play list and it's very disturbing.

Uh, Uh, Uh, Uh, Uh,

After watching your video I tried it and it did the trick thanks

Always good to come across another Texas based gun channel, Nice work, subbed

Switch to a platform that works

they are primarily junk

Only buy Pmag you can't go wrong

Thermold mags are serious pieces of $hit.

God this is hard to watch

Jesus christ know what your doing when making a video how many times can you say and um? And expect people to watch this?