Sticky opening on a Parker Trojan 20 drove me crazy for a while, another one I owned close in serial # never had a problem. Took it apart cleaned everything still sticky. Switched to better quality factory loads and troubles went away. The sticky gun was nearly unfired other well worn. Tight and trouble with some shells was my problem .
Winchester steel head shells current production are terrible, try some AA or Remington STS before you do anything else
William
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