Fed

Any thought of supporting the Forum Runner app?

Does anyone know where I can find a mounting rail for the PX4? I'd like to mount a small scope or red dot sight on it.

Did you find a replacement part for your hopup (which is what seems to be broken)? I'd be interested where you found it if you did.

I am the person who brought up the question of whether the shearing was from racking the slide with the safety on. That was with gen1. I replaced it with a gen2. I did not rack it with the safety on, and the 'new' metal area that sheared did the same thing after a while. My conclusion is: 1) Racking the slide with the safety on is not the problem. 2) Gen2 did not solve the problem. 3) The problem is probably from poor metal. My question is: Does this happen with the original TM PX4?

Do you think that changing the barel and hopup on the 3PX4 would improve accuracy?

Any update regarding the shard of meal that breaks off the slide internally. The new version of the slide does not seem to fix the problem. The shard broke off again. And I did NOT cock the slide with the safety on this time at all. I suppose a jammed BB may be causing the breakage. I give up. In any case, the gun works just fine.

Mine was in the exact same box. I am sure that it's a new batch, the piece of metal is different.

I just got the replacement for my 3PX4. It seems the new batch of 3PX4s have a slightly changed design, in that the piece of metal that broke off in the old version is now half the size. It is hard to describe, but it looks good. So far I have not had a recurrent break on this new gun. I haven't tried to cock it with the safety on, and I think I just won't even try it. Well done for HK to fix the problem.

Where is your barrel broken?

Hey didn't know I shouldn't cock it with the safety on. Besides, it returned no problem each time. Maybe it was a combo thing. Also, many other people have had the same issue, so maybe that isn't even the cause. Anyhow, the store is replacing the gun, so I'll not do this again, and see if the problem recurs. Btw, I found Guarder makes a replacement slide for $50

The main area of denting is actuall yjust above the imprinted "9" on the same piece. You can see it in the chamber with the gun in normal position. I took some photos, but cannot figure out how to post images here. After further investigation, it looks to me that the problem may start with cocking and releasing the slide with the safety ON. The safety pushes the trigger back into unlocked position, adding resistance to the slide when it returns to normal position, and this increase in resistance may be what is causing the dent in the outer barrel just above the imprinted "9" which in tu

About 4:10 into this video will show exactly what I am talking about. Look for the denting on the outer barrel near the top of the mid chamber, and at the rear end. www.youtube.com/watch?v=7MqrwLpbP0g

I have a possible explanation for the issue, mentioned previously, of a metal shard that comes off the slide after a few mags of shooting. I noticed that the outer barel has two areas with denting from what seems to be abnormal wear. One is on the square part of the outer barel, to the left of the imprinted "9 para". This one is significant. The other is on the back end of the outer barel, where it can contact the rear of the open chamber on the slide. It seems that the "9 para" denting is from the metal hitting a stop on the inside of the slide when it kicks back (on blowback).