No issue with "the runs"? I had a couple dry spots the first couple times being conservative with the epoxy so no I give it a little extra for good measure.
Another diy carbon fibre stock, Round 2!
- Thread starter Ice-kub
- Start date
Nov 23, 2025
It has been quite some time since an update. Decided I didn't like the aluminum bedding block and instead, filled the bedding box block full of free form air mixed with 1/4-1/2" carbon fibre chop. Used xps foam blocks as the negative space for the trigger/mag wells and filled it all in. Que lots of shaping/Sanding/adding more free form air... Repeat until mostly happy.
Expoxied some 3/8" aluminum tubes in as pillars, had tape wrapped around action screws to centre in pillars when torqing action into stock.
Filled in area around bottom metal with more FFA and carbon chop. Sprayed the bottom metal with almost enough release agent... Thought I was going to have to cut it out and start over. Put it in the deep freeze for a night and hit it with a dowel and hammer from the top side at the front and back of the mag well a couple times and it let go.
Shaved/sanded more out of the top side of the action inlet and decided to attempt to bed the action now that the pillars and bottom metal were sorted.
Sprayed a ridiculous amount of release agent on the action/lug/barrel and prayed to the epoxy gods. They were merciful this time and it came out way nicer than I thought it would. (if there is a next time, I would build a carbon box as I did previously, tape off the action and fill the box with an epoxy dough/carbon chop mix and build from the centre out.)
Drilled holes in the butt end and screwed the oversized grind to fit recoil pad to it.
Figured it was in a shootable state at this point so I took it out for a test drive. Fancy paint job to come. Torqued action screws to 60 inch pounds and put my nx8 on it.
Bore sited and put the first round 1/2" low at 100, ya ya, pics or it didn't happen lol it did.
Shot 30 rounds through it and it drives nice. No visable cracks or damage, no crunchy sounds when "flexing" it to look for cracks.
Will inspect further after taking it hunting this coming weekend.
It has been quite some time since an update. Decided I didn't like the aluminum bedding block and instead, filled the bedding box block full of free form air mixed with 1/4-1/2" carbon fibre chop. Used xps foam blocks as the negative space for the trigger/mag wells and filled it all in. Que lots of shaping/Sanding/adding more free form air... Repeat until mostly happy.
Expoxied some 3/8" aluminum tubes in as pillars, had tape wrapped around action screws to centre in pillars when torqing action into stock.
Filled in area around bottom metal with more FFA and carbon chop. Sprayed the bottom metal with almost enough release agent... Thought I was going to have to cut it out and start over. Put it in the deep freeze for a night and hit it with a dowel and hammer from the top side at the front and back of the mag well a couple times and it let go.
Shaved/sanded more out of the top side of the action inlet and decided to attempt to bed the action now that the pillars and bottom metal were sorted.
Sprayed a ridiculous amount of release agent on the action/lug/barrel and prayed to the epoxy gods. They were merciful this time and it came out way nicer than I thought it would. (if there is a next time, I would build a carbon box as I did previously, tape off the action and fill the box with an epoxy dough/carbon chop mix and build from the centre out.)
Drilled holes in the butt end and screwed the oversized grind to fit recoil pad to it.
Figured it was in a shootable state at this point so I took it out for a test drive. Fancy paint job to come. Torqued action screws to 60 inch pounds and put my nx8 on it.
Bore sited and put the first round 1/2" low at 100, ya ya, pics or it didn't happen lol it did.
Shot 30 rounds through it and it drives nice. No visable cracks or damage, no crunchy sounds when "flexing" it to look for cracks.
Will inspect further after taking it hunting this coming weekend.
You definitely have to plan for how to handle runs, but I almost feel like some thinner products might reduce risk of runs because you can apply a thinner coat. Each resin is probably a little unique in how it runs
I've heard of guys mixing acetone into the resin in small percentages to achieve a thinner mix. Have you tried this?
I haven’t. I would give it a try on a small test piece before committing to using in on a project
ROUND 2!!!
The first stock was definitely a learning experience. Shout out to @RepeatPete and @hpmr for posting their builds with lots of photos and detailed explanations of the process. Also thanks to @Gobber for his expertise on the subject. All have been a wealth of knowledge.
Onto round two.
Decided I wanted a backbone for a pretty "aggressive" grip area. Backbone is a 12mm OD/10mm ID carbon tube with three 6mm OD/4mm ID carbon tubes to make a triangle. Made a mold from some extra foam and packed free form air/carbon chop around it. Dug out a ton of foam and epoxies the back bone in. Used the piece of foam for the mold and inserted it back into the stock on top of the back bone.
Cut out two 15mm x 15mm x about 8inch sections along the bottom of the forend, one on each side and filled with freeform air/cf chop to bridge the area where the recoil lug will be located to the grip where it meets with more freeform from installing the backbone and the two layers of cf running longitudinal down the stock.
After that, onto shaping and sanding.
1.75 inch trigger pull, 7° negative comb, toe is flat and parrell with the thin section of the forend, almost parallel with the mid section.
Currently weights 12 oz, may add a couple thin strips of aluminum in the forend and toe for hard points to drill/tap for sling studs or rails.
The first stock was definitely a learning experience. Shout out to @RepeatPete and @hpmr for posting their builds with lots of photos and detailed explanations of the process. Also thanks to @Gobber for his expertise on the subject. All have been a wealth of knowledge.
Onto round two.
Decided I wanted a backbone for a pretty "aggressive" grip area. Backbone is a 12mm OD/10mm ID carbon tube with three 6mm OD/4mm ID carbon tubes to make a triangle. Made a mold from some extra foam and packed free form air/carbon chop around it. Dug out a ton of foam and epoxies the back bone in. Used the piece of foam for the mold and inserted it back into the stock on top of the back bone.
Cut out two 15mm x 15mm x about 8inch sections along the bottom of the forend, one on each side and filled with freeform air/cf chop to bridge the area where the recoil lug will be located to the grip where it meets with more freeform from installing the backbone and the two layers of cf running longitudinal down the stock.
After that, onto shaping and sanding.
1.75 inch trigger pull, 7° negative comb, toe is flat and parrell with the thin section of the forend, almost parallel with the mid section.
Currently weights 12 oz, may add a couple thin strips of aluminum in the forend and toe for hard points to drill/tap for sling studs or rails.
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RepeatPete
Lil-Rokslider
- Joined
- Aug 13, 2023
- Messages
- 228
Looks great!
