Machining, if you don't know a guy, can be fairly costly. We're just trying to save you some money.
I would know personally, since I'm a machinist and I've done a LOT of custom mods over the years. It's worth it in time wasted alone to just buy a better suited product. And advice never hurt anyone, right? lol
Have you considered a crane stock?
The lipo sticks fit in the battery channels, leaving the buffer tube itself empty, AND you can run two batteries.
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