Just picked up a sweet little 10/22 today from a fellow NWFA member, the serial # shows it being made around 1980 or so. I took it to the range and was pleasantly surprised to discover that, unlike my newer 10/22 (made in 2013) this old gal runs 100% with the el cheapo plastic lipped Butler Creek 25 round mags which cost about half of what the BX-25's go for. I've had several of these guns over the years and it dawned on me that all of the older ones work just fine with the Butler Creeks but the newer ones will NOT feed reliably with them once there are more than about 15 rounds loaded in. The newer ones only seem to work right with the Ruger BX 25 mags or the factory 10 rounders. Even the steel lipped Butler Creeks wont feed in my newer rifle, but they fed like a champ in the old one. Is it possible that Ruger made some changes in their newer 10/22's in order to force buyers to purchase genuine Ruger mags? At first I thought that the Butler Creeks were just poorly made, but they worked fine for me today in my older gun. Its odd that two (supposedly) identical guns using the same ammo on the same day would show such a difference in reliability with the same aftermarket mags. Opinions?