Hi!
Since the CZ is the almost only pistol where the grip frame rails clutch the slide rails from out (any other gun p. ex. the 1911 does this vice versa) it is easy to make both parts so tight you have to lap thrm together:
What you need is a strong vise with paddings and a little courage. Clamp, before that emptied from parts, the grip with the rails into the vise and put slightly power on the lever.
With some carefulness there is no marring or too much squeezing whatsoever. Quite the contrary when you release the vise lever the grip frame springs back and so you have to do it several times in small amounts of pressure and now and then check if the slide is still fitting in the rails or not.
If you want to lap both parts in like a custom build gun with oversized slide and frame you can do this until the slide not longer rails in.
That sounds really difficoult and dagerious but it is not.
I did this with two of my CZ75 and to the 75s from companions as well.
The requirement is the barrel to slide fit is optimal.
After squezzing the steel grip you fix it in the vise and then rail on the slide, a rubber hammer and some abrasive lapping compound makes it work in after some ellbow grease invested.
When after all the slide runs free enough in the rails you clean it all and lube, reassemble the gun and give it some 100 rounds to break in, probly a stronger recoil spring will help at the first time.
BTW this is not my invention!
The special pistolsmith working for the huge german company Frankonia which is the distributor is doing this to the cz75 ff. they where tuning up for best results because these guns are made for service and military duties and not for precise target shooting.
On the other hand is the SP1 exactly made for this purpose and therefore should not have such a loose.
Even if is a good shooter I wouldn't like the rattling either.
Best regards
Mathi
