Could any one help me find out if there are some clip extensions
for HK45 full size like they make for glocks? If so please let me
know thanks for your help.
When you say clip extension for a USP.45F do you mean the pinky rest? Your HK manual for the gun should identify the part number, look under the Tactical parts list. Should you have specific questions for your USP, I'm sure a few people here can answer them, but you might want to check out the HKPRO web site. Look up www.hkpro.com
Magazine extension, as in adding rounds - no. Only way to make it into a 12 rounder would be to replace the plastic insert that locks the baseplate IIRC with a flatter one - a LEO part.