Yep, it is possible, however you will need to source new guts. The only difference between the sys7 and the standard frame is the magazine catch.
The sys7 was re-designed such that it will work with both the standard USP and USP sys7 magazine. The standard USP frame on the other hand will only accommodate the standard USP mag and will not hold the USP sys7 mag.
All that would be required to make the standard USP frame work with the USP sys7 mag would be a simple replacement of the magazine catch.
Bottom line, sell you gun and buy a new one, or find a retailer that will ship you everything but the frame.
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