[JooJooBurger]

Hey, gents. I have two USP 9s. USP 1 has about 7000 rounds through it and USP 2 has 750 rounds through it. I picked it up less than a week ago.

USP 1 is very smooth and very effortless to cycle. USP 2 started out smooth when I brought it home. After two range trips totaling 750 rounds, the slide begins to seize and bind up halfway through the slide travel. It still shoots reliably, but has noticeable felt and audible friction. It makes a sand paper or light screeching noise when hand cycling. I do not recall this ever happening during USP 1's life with me.

USP 1 is a BD and USP 2 is a new BG. I'm the first owner on both. Thoughts? I appreciate the help.

Cheers

 

[dragnet]

Pics of the internals would help troubleshoot any faults in the parts.

 

[Hawk777]

Check the polymer over the frame rails isnt all balled up and that the slide rails are clean from debris. I just got a P30L that actually would stick open half way back just needed wore down I guess. I dont know what is going on with these.

 

[JooJooBurger]

I'll try to get that. I did some trouble shooting.

I took both of the USPs and swapped out parts one at a time, including the barrel, slide, recoil spring assembly and the slide stop. I determined that if I put the BG slide on the BD frame, it cycled smooth. If I put the BD slide on the BG frame, it got rough again. I'm beginning to wonder if the BG frame was damaged during that shooting somehow.

 

[Hawk777]

Well HK frames have metal slide rails that are covered with polymer when they are new it eventually wears off. Then they run really smooth. Some times the polymer balls up on one side before it wears off and causes dragging.

 

[JooJooBurger]

Check the polymer over the frame rails isnt all balled up and that the slide rails are clean from debris. I just got a P30L that actually would stick open half way back just needed wore down I guess. I dont know what is going on with these.

That might be what it is, however, the first half of the slide cycling is smooth, as it should be, then it starts to get rough. I'll take pictures when I can. From what I see, it looks relatively normal on the rails.

 

[AviatorDave]

Get a black marksalot and blacken all of the surfaces that contact each other. Pull back and release the slide several times. Then take it apart and look for the shiny spots. That's where the parts are rubbing together.

 

[kneedeep]

Do you have anything mounted on USP 2's rail?

 

[JooJooBurger]

Okay, so pictures inbound soon, but it looks like Hawk777 is correct. I ran only the slides of both USP 1 and 2 on USP 2's frame and they both bind without a barrel or recoil spring assembly installed. They're both as a baby's ass on USP 1's frame.

The frame rails look pretty similar to each other. I can't really find why it's binding.