[Big Bore]

A lot of people ask if the JF can be fitted to their compacts and while some of us have done it, the problem remains of what magazines to use. Making your own was the only solution by cutting and welding mags together or other tricks (such as using Euro P2K mags in 9mm and .40 with modified floor plates), but with the coming of the HK 45 and HK45 Compact 10 round mags, mags are no longer an issue, at least with the USPC.45. The hard part is making the Jet Funnel fit the Compact. No modifications are needed on the lanyard loop insert that comes with the JF. Just pop it in the Compact.
Below is the standard USP Jet Funnel

And the standard JF on the full size USP 9mm/40

Below is what the JF looks like installed on the Compact, in this case a .45, IF you did it unaltered.

The way I made the JF fit without altering the USPC frame any was to cut and file down the front and top, then shave the sides and back on a belt sander. Finish was done with Brownell's Aluma-Hyde II matte black.

Here are some before and after comparisons.

Below is how the modified JF looks installed on the USPC .45

Now you need to modify the floor plate of the HK45C magazine which is very easy and takes only a few minutes. Simply cut off the top of the floor plate above the front floor plate notch.

Here is how it looks when done.

So, now this winter when it is just too lousy to go outside, grab your file, Dremmel tool, and belt sander and make yourself a JF for your USPC.

 

[F22_RaptoR]

Big Bore, Very cool How-to!

I will probly be using this when my Jet funnel comes, for my Mark23, although the magazines will take a little more to get the 10-rounders to work.

 

[kevins_garage]

That does look a little better than just the 10 round mag stuck in a USPc .45.

If you were to just grind off the front of the mag well area on the frame, would the jet funnel fit the Compact .45 just fine?

 

[F22_RaptoR]

It looks like its a little longer, but i think it may prohibit the magazine from going in (lengthways, not heightways)

 

[Big Bore]

No, you cannot just grind off the front. The top needs to be filed or milled down for it to fit flush against the bottom of the mag well. By the time I had filed down the top to the point it fit under the ledge of the USPC front part of the grip, the front part of the JF was very thin so I went ahead and removed it. The last thing I wanted to do was do any modification to the pistol's frame. Almost every part of the JF needs to be thinned, front, top, sides, and back, in order to make it blend in with the grip of the USPC. Even more would have to be done to make it blend with the 9mm/40 frame.