Gunsmithing Installing a Sig Collapsible stock on a standard AR15 lower

[waveslayer]

For Christmas I was given a new Sig Collapsible stock with an AR15 adapter kit to run it on a standard AR15. The stock won't fit around the buffer tube mount on a standard AR15 lower. I saw one guy filed down the lower and was able to reteo fit the stock, anyone else have experience with this. Or I bite the bullet and get a Spear LT lower. I'm running a Sig Spear LT upper

 

[WindstormSCR]

the scallop cuts you'd need would go right through the thread iirc, and the adapter that goes on the back of the lower isn't set up for it either.

I've not seen any MCX standalone lowers for sale that weren't the price of an entire new MCX anyway, so I'd say get a new MCX/MPX pistol of your choosing and mix and match uppers and lowers to wind up with the two setups you want


personal opinion, after using the thin folder and the collapsing, the thin folder with the cheekrest and a little foam padding wins by a country mile (see pic)