problem with ptr 91

[ldsparamedic]

Hi all, I have a PTR 91, which is basically an HK91 only the receiver is made in usa, all other parts are off the HK.

I can fire about 3-5 rounds before the firing pin does not strike the primer hard enough to make a round fire. I am using surplus military ammo. I have cleaned the rifle repeately but the problem persists. This is a fairly new rifle with fewer than 100 rounds through it. Help!

[Pitdog]

Check the primer seating, and make sure they aren't seated too deep for the F.P. protrusion.
What type of surplus ammo is it? I don't suggest trying the commercial ammo in it, if it has the fluted HK chamber it will tear case heads off and you will have stuck case bodies. Inspect the ammo first, if you have several different lots from several different countries, then it may be a gun problem, if it is on lot, one country, I'd say ammo first.

[ArmySGT.]

Check the primer seating, and make sure they aren't seated too deep for the F.P. protrusion.
What type of surplus ammo is it? I don't suggest trying the commercial ammo in it, if it has the fluted HK chamber it will tear case heads off and you will have stuck case bodies. Inspect the ammo first, if you have several different lots from several different countries, then it may be a gun problem, if it is on lot, one country, I'd say ammo first.

What Pitdog said,

And, I am working without a diagram here.

A) is the firing pin of the correct length?
B) is a burr or rough spot hanging up the hammer and causing light strikes?
C) Hammer spring have a kink or crack in it?
D) Does the Hammer rotate all the way to vertical?
E) Is the ammo longer than spec length?
F) Are the shoulders at the same distance (length from base) on the brass?
G) Is this happening with the same magazine?

[gunsmoke]

Is the surplus ammo by any chance INDIAN or PAKISTANI? If so I would be willing to bet ArmySgt. hit the head on the nail with his possibility "E"

[ldsparamedic]

What Pitdog said,

And, I am working without a diagram here.

A) is the firing pin of the correct length?
B) is a burr or rough spot hanging up the hammer and causing light strikes?
C) Hammer spring have a kink or crack in it?
D) Does the Hammer rotate all the way to vertical?
E) Is the ammo longer than spec length?
F) Are the shoulders at the same distance (length from base) on the brass?
G) Is this happening with the same magazine?

A-F - I'll have to check. G - it is not. I should also mention that the brass comes out very dirty on the lower half, and there is a dimple on the primer of the rounds which did not fire. Could it be the firing pin is becoming fouled and cannot strike hard enough? I have cleaned and cleaned the firing pin ass'y repeatedly.

[ArmySGT.]

A-F - I'll have to check. G - it is not. I should also mention that the brass comes out very dirty on the lower half, and there is a dimple on the primer of the rounds which did not fire. Could it be the firing pin is becoming fouled and cannot strike hard enough? I have cleaned and cleaned the firing pin ass'y repeatedly.

If the firing pin, the firing pin spring, and the parts they travel through are all spotlessly clean and lightly oil. This is not the problem.

http://www.recguns.com/Sources/faldiag.html

Seeing as it is has a gas piston system, is the gas system clean and oil free? Are the gas ports clean. what setting is the gas port selector on (if your model has one).

One of you lots of ammo may not be cycling the because the ammo is not producing enough propellant gases.

However despite all that you say that the ammo that didn't fire has had the primer dimpled.

So that is one of two things A) a light firing pin strike or B) bad ammo. So check the head stamps (the markings where the firing pin is) separate all this ammo from your other surplus.

Load one magazine with this stuff and another magazine with a different manufacturers ammo.

Fire both magazines. If it is the ammo, the ammo with the same marking will have dimpled misfires. If it is the weapon, then you will still have dimpled no fires with both ammo lots.

[gunsmoke]

Seeing as it is has a gas piston system, is the gas system clean and oil free? Are the gas ports clean. what setting is the gas port selector on (if your model has one).



Sarge the entire CETME G-3 series is definitely NOT a gas piston operated system it is a roller-locked DELAYED BLOWBACK RECOIL OPERATED SYSTEM An evoluton of the MG42 and MG3 system.

[ArmySGT.]

[QUOTE=ArmySGT.;163420]

Seeing as it is has a gas piston system, is the gas system clean and oil free? Are the gas ports clean. what setting is the gas port selector on (if your model has one).

QUOTE]

Sarge the entire CETME G_# series is definitely NOT a gas piston operated system it is a roller-locked DELAYED BLOWBACK RECOIL OPERATED SYATEM An evoluton of the system used on the MG42 and MG3 system.

My fault I was thinking it was another clone of the FAL. This is why the "help me" thread should include pics.

[gunsmoke]

When th HK 41s came into the country I bought 2. I never did warm up to them I found them quirky, less than 100%reliable and being a handloader I did not like what the fluted chamber did to the brass. I didn't have them long enough to tell you if the fluted chamber really shortened the life of the brass but it was bad enough that ny Redding Match USB sizer couldn't take the flutes entirely out of the brass.

I was young and foolish then, should have just cleaned them up real well put them back in the boxes and stuck them in the back of the safe, they'd go for 6K ea now less than 400 made it in before ATF slammed the door and the 51 replaced the 41. Both my 41s had the Rhinemetal Made one piece forged bolt carriers as opposed to the HK three piece welded up BC, if I knew then what I know now I would still have both of those carriers, they are worth a fortune!

[ldsparamedic]

Well folks, after cleaning the crap out of it, and another trip into town to the gun shop to be shown you have to manally advance the bolt in order to put the stupid thing back, back out to the desert and I shot almost a full magazine before the bolt stuck. I don't think I oiled it enough. I did get the bolt freed after a hard pull on the cocking handle. I can't believe this is the rifle used by the German Army. It is very quirky. I never had any problems with the AK-47 I owned ad got rid of 10 years ago. I do like the .308 caliber and have lots of brass and loaded ammo for it. I think I'm gonna get rid of this thing as it is unreliable and wouldn't want to have to trust it with my life. Does anyone have a recommendation for a replacement?

[ArmySGT.]

Well folks, after cleaning the crap out of it, and another trip into town to the gun shop to be shown you have to manally advance the bolt in order to put the stupid thing back, back out to the desert and I shot almost a full magazine before the bolt stuck. I don't think I oiled it enough. I did get the bolt freed after a hard pull on the cocking handle. I can't believe this is the rifle used by the German Army. It is very quirky. I never had any problems with the AK-47 I owned ad got rid of 10 years ago. I do like the .308 caliber and have lots of brass and loaded ammo for it. I think I'm gonna get rid of this thing as it is unreliable and wouldn't want to have to trust it with my life. Does anyone have a recommendation for a replacement?

I have an M1A, that loads and shoots wonderfully as well as a Ishapore 2A that does the same each is chambered in 7.62x51 NATO. I have been acquiring spare parts for each.

[Pitdog]

LOVE the M1A! Ishapore is a good piece too.

[Stinger]

Armalite AR-10 (http://www.webarms.com/Gun%20Suppliers/Armalite/armalite.html)

Neat Video! (http://www.youtube.com/watch?v=UECsUQD2a5U)

Pretty Good Review (http://www.rifleshootermag.com/featured_rifles/sass_071207/index.html)

[gunsmoke]

Well folks, after cleaning the crap out of it, and another trip into town to the gun shop to be shown you have to manally advance the bolt in order to put the stupid thing back, back out to the desert and I shot almost a full magazine before the bolt stuck. I don't think I oiled it enough. I did get the bolt freed after a hard pull on the cocking handle. I can't believe this is the rifle used by the German Army. It is very quirky. I never had any problems with the AK-47 I owned ad got rid of 10 years ago. I do like the .308 caliber and have lots of brass and loaded ammo for it. I think I'm gonna get rid of this thing as it is unreliable and wouldn't want to have to trust it with my life. Does anyone have a recommendation for a replacement?

GO FAL you'll never go back. Thr only thing that compares with it for reliability is Timex watches and AK47s (I DID NOT SAY AKM).stay away from anything produced by CENTURY ARMS and anything built on a Hesse reseiver. If you can find Belgian for under $2500 jump on it, The ENTERPRISE ARMS AND DSA are excellent, the Argentine IMBEL ARE THE EQUIV OF BELGIAN. Parts and magazines a plentiful and cheap cheap cheap. 120 or so countries used it so options are almost limitless.

The only other 7.62x51 I use and trust is the Galil ARM but in 7.62 Nato parts are hard to get and hi-cap mags are $100/ea and the rifle starts at $3500.

You can get a REAL GOOD USED DSA FAL for about $1200 and it'll be the last rifle you ever have to buy.

[essayons4791]

100% on the AK47. You can't beat them. I thought about the 91, but then I remembered that the Germans love bells and whistles on their guns, and I've never been a big fan of their stuff (except the MG42, which soldiers on to this day). You can sell your 91 and get a top quality Arsenal Inc. AK and still have a couple of bills left over.