AR9MM FTF Ramp Issue?

[Calico1404]

I am experiencing FTF with multiple magwell blocks. Colt and Promag.

It seems that as I hand cycle the round is literally snub nosing right into the wall of the barrel. I tried to cycle multiple times, with about 8 of 10 rounds doing this, either hitting the barrel wall or stove piping anywhere but into the chamber, prior to be sending back yet another block and spending $200 on a Hahn would anyone have suggestions? I disassembled the Block to see if I can raise the feed ramps and it is impossible.

Wylde 7" 9mm barrel, 80% cnc lower, promag and colt adapter, colt mags or Uzi modified and unmodified.

It seems as if the ramp is not raising the pitch of the round enough to enter the chamber as I see brass and fragments at the base of the barrel indicating the round is undershooting the chamber.

[ar15barrels]

Hand cycling is NOT the way to test actual function.
Come back after you have LIVE fired the rifle and report the results.

[Calico1404]

Apologies, I did live fire with same issue, Stove pipe or Head of round into the wall of the barrel causing a FTF and me shaking and dumping the loose round, charging again, 1 shot, same issue, The rounds as you can see are literally head butting into the barrel wall. I hand cycled again last night and full charge handle and release to let fly, no walking it back over the round so I can tell it is getting a full forward momentum to hit that ramp. It seems as if the round does not pitch up enough. I thought about taking a dremel to the ramp and creating guides as seen on Hahn and others.

[ar15barrels]

When the gun is operating, the charging handle is latched into the upper receiver.
Only the bolt/buffer/spring are moving.
If you pull the charging handle back and let it fly, the charging handle SLOWS down the bolt movement because the charging handle bounces up and down in the charging handle slot as it is being pulled forward by the bolt.

I don't see a feedramp in your pictures.
It would help to have a block with a feedramp to get the cartridges from the magazine to the chamber.
You can also try opening up the front of the magazine lips to get the cartridge pointed more towards the chamber so it does not need to move upwards as much to reach the chamber.

[Calico1404]

Your right about the charging handle, its my attempt to at least see where the round is "trying to go" If you look under the round you will see the ramp, its does sit low it is a top load. It almost seems that if I had ramps on the barrel like 223 that it would guide in with no issues.

[ar15barrels]

It almost seems that if I had ramps on the barrel like 223 that it would guide in with no issues.

It's not possible to have feedramps like a 223 because the breech face is moved back OUTSIDE the barrel on a blowback 9mm.
The mag block should have the feedramps to get the bullet up into the chamber before it even gets there.

Try some different magazines.
The magazines you have don't seem to be letting the cartridge sit high enough.

[Jon Road King]

Well, the Promag adapter is a pile of crap, so no wonder that one isn't working for you.

But it sure looks like that feed ramp on the magwell adapter is low... I seem to recall reading that the Colt adapter (from Brownell's?) was a permanent install - necessitating drilling and pinning the adapter into the lower. Have you done that? I imagine, if you haven't, it is possible that the adapter is getting pushed lower than it should be in the magwell (when the bolt slams across the magazine). Although, I am unfamiliar with the Colt adapter, and not sure if it has play in the magazine catch slot to even drift low... just something to look at.

[Calico1404]

haha, I hear that a lot about the promag, just couldnt see doing the $180 on Hahn when a dedicated lower in 9 is only $150 lol.

Both adapters have lips above the mag well in order to keep it from sinking once the bolt runs over it. The bolt even has guides for the feed ramp walls and I can see that it rubs so its making good contact.

I am leaning towards either a 9mm dedicated or a hahn block. I am seeking a functional 9mm pistol as my pdw and reliability is an obvious must. I am just surprised that there is not an adjustment for the ramp to raise and lower as needed.

[Spyder]

Why not go with the 30 dollar Palmetto one, that doesn't require any permanent alteration to the lower?

[Calico1404]

out of stock and is same basic design as the Promag adapter.

I was actually impressed with Promags construction. It all comes down to the ramp. The promag does not pitch up enough to direct the round into the chamber, the spikes style I used has a little more of an angled but without the actual guide groves for the rounds to follow there is no real consistency on feeding. It seems that Hahns Ramp has the guides. I may take a dremel and see if I can create the groves on the ramp like some of the high dollar ones. Worse case I am seeing these Dedicated 9mm 80%'s that I may look into as I have a few jigs and have built about 7 ARs now (the first one was horrible haha)

[Jon Road King]

My PSA adapter runs like a champ, never choked on anything (just fyi, heh).

Then again, as Randall suggested, I would look at mags next if I were you. If two different magblocks aren't working in the same way, then there must be some other variable... and 9mm mags are fickle :/ When you say Colt mags, do you mean actual Colt mags, or Colt pattern mags? (ASC or Promag possibly?)

And if you find a 9mm 80% in stock anywhere, give a holler... seems Palmetto Defense stopped making them, and they are getting scarce...

[Calico1404]

Actual Colt Mags, I also tried unmodified Uzi and Modified Uzi mags. The mags sit in the adapter proper, just as the round leaves the mag, when it should ramp up, its not, its almost just a few degrees from a proper raise to the chamber. FYI SMF $89.00 I think its a great buy if my jig will work.

http://smftactical.com/ar15-9mm-80/

[Jon Road King]

Actual Colt Mags, I also tried unmodified Uzi and Modified Uzi mags. The mags sit in the adapter proper, just as the round leaves the mag, when it should ramp up, its not, its almost just a few degrees from a proper raise to the chamber. FYI SMF $89.00 I think its a great buy if my jig will work.

http://smftactical.com/ar15-9mm-80/

Yeah, I have found those too.. but don't forget to add another $45 for the ramp and ejector that's not included, heh.

(although, the 'reduced magwell' option sounds intriguing... but I was gonna do that on my mill anyway, heh)

[Calico1404]

haha. Yes I saw that tricky $45 parts kit too. lol
Dedicated does seem nice though. The few rounds I got out of this 7.5" build was sooo nice, almost like shooting suppressed , zero kick, low sound and great control. Just wish I could load and drop mags over and over like in my standard 5.56 I cant handle the possibility of 4 of 10 not cambering. Ill get frustrated and just throw my pistol at the enemy.

[Cheep]

PSA magwell adapter & ASC mags, good to go in two builds.