JP Enterprises SCS Alternative Spacer A5-Length Buffer Tubes White. This spacer is standardized to function without modification for the VLTOR/Bravo Company tubes with an internal length of approx. 7.75 inches. Because other manufacturers hold slightly different A5 tube lengths some easy trimming of this spacer may be necessary. In some cases the A5 buffer tube may need to be backed out one rotation for proper fitment. Specifications for JP Enterprises SCS Alternative A5 Spacer: Manufacturer: JP Enterprises Color: White Features of JP Enterprises SCS Alternative A5 Spacer Allows JP Silent Captured Spring systems to be installed in an A5-length buffer tube. Package Contents: JP Enterprises SCS Alternative A5 Spacer JP Enterprises JPSCS2-SPACER-A5: SCS Alternative Spacer A5-Length Buffer Tubes White