Sounds like the later model model production from USRAC, are they on the lower end, yes. Are they servicable, most likely. There is no way to know when they were made without the s/n. You can probably shoot USRAC an email or pick up a copy of the Shooter's Bible. The New Haven plant ceased production when was it back in 2006/2007. So your guns are ballpark 4-8 years old most likely.