if it is indeed milspec tube, i know from experience that on the sr25 using a proper ar10 standard rifle buffer tube that an a2 will fit, but you have to install without the spacer.
Something's not right here. The spacer is still required if using an A2 length stock. No spacer if using A1 length.
Spring compression has nothing to with it. The interior depth is the same regardless of stock, spring or buffer length.























































