i have a romy ak47 with a US made receiver. i shot 200 rounds thru it today, never a jam or ftf but some times the bolt didnt shut all the way when i cycled it by hand after loading a mag, i had to bump it with my hand. i think my headspace may be to tight. does any one have any gauges or shade tree methods of checking it? or does any one check and adjust the headspace locally? i have heard of some people using pennys against the barrel and hitting it with a hammer if very little adjustment is needed. got any suggestions?