Re: 10/22 magnum Sporter project
Posted: Wed Aug 12, 2026 11:31 pm
So, went back to the range with some Federal ammo but only saw a marginal improvement. But I was shooting from a folding table shared with another shooter at a club shoot. A problem cropped up with trigger; every few rounds the trigger would lock forward as if the safety was on. Cycling the bolt, ejecting a round, would clear it. I haven't looked into it yet - might be a lubrication problem. Any suggestions?
I acquired another donor gun to make that Feddersen bull barrel Sporter. It has a 21 3/4" Clark bull barrel in .17 HMR mounted in a Boyds laminated thumbhole stock. It was described by the seller as being set-up as a single-shot but it doesn't have the typical lock and release mechanism. What it does have is a very strange aftermarket trigger assembly that bears little resemblance to any 10/22 trigger group I've ever seen. The safety is behind the trigger and the internals are all different, including what looks like an adjustment screw. The bolt lock-back mechanism is very different. I hope someone can identify it. Here are some photos:
UPDATE: After spending some time with that trigger assembly, partially disassembling it to free-up the stuck bolt lock-back mechanism, it appears that it is not designed for single-shot use but, because it has a much stronger hammer spring, it is designed to mitigate the higher blow-back energy of the .17 HMR round in semi-auto operation. Cycling the bolt is much more difficult than with an OEM style trigger group.
This 2004 receiver has the same cast-in markings as the one from 2001 (E in a circle and A in a rectangle). It also has a single extractor bolt although it could have been switched out because the exposed side has been jewelled.
UPDATE II: The firing pin has been pinned so, apparently, this bolt was sent to CPC (Connecticut Precision Chambering) for modification. Unfortunately, it seems Randy has closed his shop.
I acquired another donor gun to make that Feddersen bull barrel Sporter. It has a 21 3/4" Clark bull barrel in .17 HMR mounted in a Boyds laminated thumbhole stock. It was described by the seller as being set-up as a single-shot but it doesn't have the typical lock and release mechanism. What it does have is a very strange aftermarket trigger assembly that bears little resemblance to any 10/22 trigger group I've ever seen. The safety is behind the trigger and the internals are all different, including what looks like an adjustment screw. The bolt lock-back mechanism is very different. I hope someone can identify it. Here are some photos:
UPDATE: After spending some time with that trigger assembly, partially disassembling it to free-up the stuck bolt lock-back mechanism, it appears that it is not designed for single-shot use but, because it has a much stronger hammer spring, it is designed to mitigate the higher blow-back energy of the .17 HMR round in semi-auto operation. Cycling the bolt is much more difficult than with an OEM style trigger group.
This 2004 receiver has the same cast-in markings as the one from 2001 (E in a circle and A in a rectangle). It also has a single extractor bolt although it could have been switched out because the exposed side has been jewelled.
UPDATE II: The firing pin has been pinned so, apparently, this bolt was sent to CPC (Connecticut Precision Chambering) for modification. Unfortunately, it seems Randy has closed his shop.