The early made ones had plastic polymer in their actions. I had one and it broke. Took it to the gunsmith and he couldn't believe it. Pulled the action apart and there was small bits and some filings, or so we thought. The rocker, transfer bar, trigger lock, lever screw was hairline cracked, and the carrier showed premature wear after only 9 rounds. Upon further inspection, we discovered that these parts were made of some space age polymer. We suspected aluminum at first. I returned the gun, and they sent me new a one. But accuracy was poor at best and I didn't trust the action after the first mishap. I sent it back and received a warranty voucher. Nice looking gun though.