[Awake777]

I took the 6.8 for its first spin. Stag upper and lower.

Used SSA 90grain Sierra Varminters.

Flawless performance with the factory mag from stag.

Had purchased 6 PRI mags (6.8). I tried one. Failure to feed, bullet jammed back in neck (I will post a pic later). Cleaned that up, tried to load another round, same thing (bullet only jammed into neck an extra 2mm). So I figure I have a bad mag.

So then I try a second PRI mag. Same thing happens!

My appetite to try the 3rd, 4th, 5th, and 6th mags at this point is non-existent.

What's the deal here? This is very frustrating.

 

[rcrandall]

First, the 90gr Sierra HO has a huge opening and get's caught easily, especially on a gun without M4 feed ramps. The CP magazines usually have a slight up-angle with the feed lips so the rounds hit the ramps at a better angle. PRI mags do not have that angle. Combine the mag and the hollow point and the rounds will hang up. The solution is to cut M4 feed ramps into the Stag, easy to do. You can either do it with a round file or have a gun smith do it, should only take a few minutes. I had no problems tweeking the cheap CP mags to give the right angle, but I haven't felt comfortable in doing this with a $40 PRI mag. I love SSA ammo, but the Sierra 90gr round is a hard one to feed. Barrett magazines have the best up angle on the feed lips.

 

[BillBond]

Which PRI mags did you use?

I had FTF problems with the old style 20 round mags that were loaded with 20 rounds.
If I loaded them with 18 everything was fine.

8)

 

[joequick]

M4 Feedramps. Makes all the difference.

I'm no machinist but had it completed with my Dremel in about 10 minutes.

 

[RoAus]

M4 Feedramps. Makes all the difference.

I'm no machinist but had it completed with my Dremel in about 10 minutes.

No before and after pictures? :?

 

[Awake777]

Which PRI mags did you use?

I had FTF problems with the old style 20 round mags that were loaded with 20 rounds.
If I loaded them with 18 everything was fine.

8)

Brand new 25 round PRI mags with 3 rounds in them apiece.

As far as I concerned, this is the worst equipment-combination disaster I have experienced. I have a gun I paid a lot of money for, mags I paid a lot of money for, ammo I paid a lot of money for, and the combination is complete @$#*.

The idea of dremeling my gun is not sounding very attractive right now.

 

[joequick]

Mike, I suspect if they ever fired the gun at the factory, they shoved a round into the chamber, pulled the trigger, then boxed it up. QC is way down right now, in my opinion. When you get a chance to see a Charles Daly, you'll see the difference. I wish Daly offered 6.8.

These are not my photos but they illustrate the problem.

Jeff

 

[Awake777]

as I mentioned before, the stag mag worked fine with the SSA 90grain varminter.

I mean, I don't care how the dang thing works, as long as it works. And with the PRI mags, it is not like the occasional FTF. It's "inability to feed a single round".

 

[paulosantos]

Mike, I've fired over 1K of those bullets with the C-Products and the PRI mags and they have worked fine. It is your upper and the bullets. You can either tweek the mags, return the mags, or take a file and file the M4 Feedramps in. When I filed mine in myself, they came out real nice and I never noticed them.

 

[BillBond]

I have used 12 of the 25 round waffle mags in three different lowers and never had a failure to feed.
Some of them do not want to drop free, but they always fire.

So I do not think your problems is the mags.
If you do not want to modify the feed ramps yet,
the next thing I would try is some 110 or 115 grain ammo.

8)

 

[Bull000]

Ya, try some different Ammo. I'm not much of a machinist, and i don't know much about changing parts for my AR, but would it be possible to buy an M4 feed ramp assembly like showin in the picture above? instead of trying to mill your own existing standard feed ramps?

 

[mogunr]

Ya, try some different Ammo. I'm not much of a machinist, and i don't know much about changing parts for my AR, but would it be possible to buy an M4 feed ramp assembly like showin in the picture above? instead of trying to mill your own existing standard feed ramps?

If you wanted to spend the $ you could buy an upper receiver with the M4 cuts and swap that with your existing receiver or you could see if there is a 68forum member close by that would be willing to swap the receiver or make the cuts in your receiver for you.

 

[Bull000]

Interesting....

 

[gdonley308]

Yes I don't think it's a mag issue. All my PRIs run great in my Kotonics uppers but they have the M4 ramps although shallow cut.

 

[Inspector 12]

I have a Rock River 6.8 and several PRI mags. I haven't tried the SSA ammo mentioned, but never a fail to feed with Remington or Hornady ammo with either the PRI or some Bushmaster mags I bought. I did check though and mine does have the M 4 feed ramps cut into the upper from the factory.

Have you considered contacting Stag if your receiver doesn't have the M 4 style feed ramps? As noted above could be a quality control issue that slipped past the factory and they would work with you to make it right.

I can sympathize, it would suck to spend hard earned dollars only to have your gun fail to feed. Good luck with this one.

 

[Bull000]

I was at the range this evening, and had a problem... failure to feed a few times. 30 rnd Barret Mags in my RRA 6.8. Shot great before, i've ripped these 30 rnd mags loose at the lease with no jams or failures. So i'm at the range with some buddies, pilinking off, enjoying the fact that my ACOG holds a great zero after being removed and put back on several times. Gun was just cleaned. and after maybe 25 rounds, i get some rounds sticking on the feed ramps, still barely in mag. I believe mine are M4 Feed Ramps. So i jacked with it, opened it, took out the bolt and looked: The feed ramp seemed a little scratched, and below the feed ramp too... but it didn't feel burred or anything. Just looked like wear and tear. Then it happened like once more, then i finished off a 30 round mag and it was fine... Why would it happen a couple times, then just stop? first time i've had jammings. I dunno... wish i could afford more ammunition to really shoot it like i need to to test it out.

 

[paulosantos]

I was at the range this evening, and had a problem... failure to feed a few times. 30 rnd Barret Mags in my RRA 6.8. Shot great before, i've ripped these 30 rnd mags loose at the lease with no jams or failures. So i'm at the range with some buddies, pilinking off, enjoying the fact that my ACOG holds a great zero after being removed and put back on several times. Gun was just cleaned. and after maybe 25 rounds, i get some rounds sticking on the feed ramps, still barely in mag. I believe mine are M4 Feed Ramps. So i jacked with it, opened it, took out the bolt and looked: The feed ramp seemed a little scratched, and below the feed ramp too... but it didn't feel burred or anything. Just looked like wear and tear. Then it happened like once more, then i finished off a 30 round mag and it was fine... Why would it happen a couple times, then just stop? first time i've had jammings. I dunno... wish i could afford more ammunition to really shoot it like i need to to test it out.

It could be just a frekish thing that happened. I'd mark that mag and keep an eye on it. Was your AR lubed pretty well? Also, what ammo were you shooting?

 

[Awake777]

a quick update:

I called PRI and told them I was having 100% failure-to-feed with the SSA ammo (the only ammo I have). They told me to send the mags back, which I finally did. I received the mags back about a week after delivery was confirmed there at PRI. I asked them what they did to the mags--"changed the bullet angle" i.e. adjusted the lips. I think he said it was 30 to 40 thousandths of an inch. I may have misheard.

Tonight checked 2 of the 6 mags to see if the rounds would feed. Same SSA ammo as before. No problem, they fed fine. Still need to take the rig out to the range and check the mags' function cycling.

So I am out the cost of shipping (with insurance) the mags to PRI, plus the time, hassle, and aggravation it took. When you pay a chunk of change for a product, you kind of hope that it actually works. But the folks I talked to at PRI were nice. I just wonder about the quality control--despite all the reasons I heard here on 68forums about why it is perfectly reasonable that I should have 100% FTF with that ammo and un-dremeled ramps. I'll be curious to know if anyone else ends up with this problem.

And for me at the end of the day to have a functioning rig without having had to dremel my upper--that makes me happy. We shall see if that's what I end up with.

 

[joshuades]

I use PRI mags as well as a few C-products. On all of them, I have tweaked the feed lips a bit so they feed smoother (a feat unneccessary on any of them). That way they were at the optimal angle for my rifle. All my mags feed on just the spring pressure now (the buffer spring still doesn't have enough force to close the bolt around the case head, but from mag to chamber the rounds feed as smooth as mechanically possible now). Remember that every piece has a tolerance and they stack, so you kind of have to taylor everything to get optimum performance (not to say that out of the box it isn't good enough).

ETA: By spring pessure I mean that from starting at the bolt resting on the round to be stripped, when I let go of the charging handle the round stripps out the mag and into the chamber.

 

[coldair]

have you lubed you rifle up hand cycled 500 times, cleaned relubed and did another 500 cycles? that has made a huge difference in my rifles