Tmbr stock

[mudduck]

Need some suggestions for stiffing the foreend on a tmbr stock I have on rimfire rifle without adding a lot of weight. I was thinking Maybe carbon arrows cut down and epoxied in.

 

[LVLAaron]

carbon arrows cut down and epoxied in.

Bingo

 

[LVLAaron]

Arrows are stiff... I'm playing with the idea of a vertical strip of carbon fiber or aluminum... Would be easy to mill in and a much thinner slot than an arrow would need.

 

[BoydAllen]

Why do you think that it needs to be stiffer? I see them used in CF benchrest and they do not seem to have any problems in that application. If you have been following long range benchrest, there has been some discussion relating to stock stiffness, and the upshot was that a little more flex in forends may make tune less critical. The issues that I see in rimfire are whether you want a stock with an angled butt, and why one would not just use a laminated stock if there is no weight limit issue. No, I do not compete in rimfire benchrest, but a close friend does and has built several top component rifles that do very well. To answer your question, for McMillan stocks, I have seen barrel channels lined with carbon fiber. I believe that that would give you what you are looking for.

 

[mudduck]

Why do you think that it needs to be stiffer? I see them used in CF benchrest and they do not seem to have any problems in that application. If you have been following long range benchrest, there has been some discussion relating to stock stiffness, and the upshot was that a little more flex in forends may make tune less critical. The issues that I see in rimfire are whether you want a stock with an angled butt, and why one would not just use a laminated stock if there is no weight limit issue. No, I do not compete in rimfire benchrest, but a close friend does and has built several top component rifles that do very well. To answer your question, for McMillan stocks, I have seen barrel channels lined with carbon fiber. I believe that that would give you what you are looking for.

Actually I’m not sure if would help or hurt it. This stock is the foam core tmbr. Hadn’t thought about tuning issues glad you mentioned that. I’ll get in touch with a couple rimfire guys that may have more information on what they have done in the past.

 

[AlNyhus]

Having done a fair number of fore end stiffening jobs, an angle shape (intersection up, obviously) is very good at adding stiffness. For most stocks, aluminum angle works great. After cutting the inlet for the channel, a self leveling, thin pour epoxy designed for bar tops works well to flow around the material....put some holes along both sides of the legs offset from each other to help the epoxy lock it into place. Inletting or somehow tying it into the area ahead of the receiver ring really helps for stiffness.

Carbon fiber angle really works great for saving weight....though in all reality, the difference in such a short amount of material versus aluminum is too small to justify the cost difference for most situations. We end up with some scrap pieces (brackets, etc) so I sometimes use that. These guys are a good source:

Carbon Fiber Angle Stock

This composite material is made of high strength 2 x 2 twill carbon fiber fabric with a binding matrix of epoxy.

www.safetyonline.com

Hope this helps. -Al