Hi folks I was at a gun shop today and found a nice looking 19-4 so I bought it. So far so good right then I took it to a range and shot about 40 rounds of Sig .38 spc through it the thing is crazy accurate but after the last 6 rounds the cylinder wont open. I have been a handgun shooter since about age 18 I'm now 57 never had this happen any suggestions or should I just take it to my local gunsmith?