JR FIREARMS

Yes it’s an ideal way of solving that problem. The boring of the hole and thread milling mean the old thread will not influence the new ones, which is what can happen when using the traditional method of drilling and tapping, as the drill and tap will want to follow the old thread.

Scope base screw repair and upgrades are helically boted and thread milled for better accuracy and tolerance, then checked to ensure they are within specification. Available in M4 x.7 and 8-40.

Seen a few Sabattis lately where the picatinny rail screws have stripped out the action under recoil. I have found various causes for this which ultimately are all down to quality issues. It’s a fairly simple fix, especially with the CNC mill. It’s a case of measuring hole spacing, a quick CAD model, then boring out and threading for larger threads, In this case 8-40. The rail also needs machining to allow fitment of the larger screws.

Yes i’ll make a note to check of some i have. Weight saving is usually minimal.

Hi Chaz, i’m unable to PM you for sime reason. Email me or text me on info@jrfirearms.co.uk or 07801432618

It’s quite a beast, 1.25” down to just over 1” at the muzzle.

Spiral fluting on this very heavy 30” barrel.

Been a bit busy of late getting rebarrels/builds off to proof by christmas. Here are a quick couple shots. IMG_0944.mov

Some may consider this a waste of time but it’s quite popular. It’s a tactical bolt conversion for RH Tikka T3/T3X’s. Obviously you can buy replacements that are normally a DIY fit, but some customers don’t like the straight aftermarket handles, or the fact they are usually a bit too long and spindly. And occasionally are a poor fit. I modify the original handle to accept one of my in-house made bolt knobs, and turn it to have a smooth transition. The end result is an improved handle with an OE look. It’s a bit more work but many customers prefer it, and i feel it looks a little nicer and unique.

First time i’ve heard that cold forging doesn’t induce stress and cut rifling does. It would be interesting to know if they apply any more inspection to fluted versions. We also know Remington barrels are hit and miss in terms or accuracy, quality etc. I see a fair few where people have issues getting on target etc. It’s not always scope base issues. As previously stated, i never said they can’t be done. Just mearly i personally won’t and it’s generally not recommended. This is based off of real world experience from my own tests and other. And i’m pretty sure i’m not the only UK rifle builder to say he same. It’s all interesting stuff though 🙂

It’s always nice to share opinions and experiences.

Button rifling will of course induce stress, but not as much as cold hammer forging, that’s what i more referring to 🙂. Once button barrels are stress relieved correctly very little stress remains that will be of any major concern. Where as hammer forged will always have stresses remaining, and often bad enough to cause issues.

It may well be one of the reasons. Obviously it can be done, but we’ll never know how many get rejected or what process they follow. Or just not bother checking and let it ship. It’s not uncommon to hear of people with factory rifles that don’t shoot, or can’t get the shot on paper as they run out of adjustment etc.

😂 very true. The money would be better spent on a new barrel or bolt fluting 😎 I’ve always read/hears about varying degrees of factory barrels stress relieving, and witnessed it with small muzzle threads on large bore calibres. But it was interesting to see first hand just how badly it can happen! Had this old Rem barrel been a customers rifle, it would be ruined. Unless there is a new competition that involves shooting round corners 🤣

Nearly all factory barrels are hammer forged, this induces stresses into the steel. When you machine the barrel with something like fluting or re-profiling, those stresses can release. This can cause swelling in the bore diameter or physical bending/warping of the barrel. This may not always cause accuracy issues, but you can get other issues such as running out of scope adjustment because the barrel is trying to shoot round a corner. Custom barrels are normally either cut rifled or button rifled, this imparts little to no stress in the steel. They also tend to undergo better heat treatment processes to relieve stresses in the steel. So when you profile or flute them the chance or causing issues is virtually zero.