I purchased a PTR 32 PDW (Gen 1)in 2010 or 2011 and have not shot it much based on me being in the Navy and varying gun laws in the states which I have lived. Initially is would fail to eject about 5% of the time. I read on this forum that it may be best to change locking pieces to something with a larger angle so I bought a 60deg locking piece for PTR 32s from HK parts.net. The weapon now ejects great and always shoots the first round but after that I often noted (nearly always) light primer strikes. After further investigation I discovered that the weapon is not returning fully to battery. If I pull the charging handle about one inch and release it the weapon goes into batterie and fires. The more rounds I shoot the better the weapon performs but I suspect this is due to expansion when it heats up. Any recommendations anyone has to fix this would be much appriceated. Thank You!