The RE-A5 receiver extension tube is designed to work
with the Vltor A5 Rifle Recoil System. Physically, the A5 tube is
slightly longer than a traditional AR-15 receiver extension tube, the A5 tube
has seven locking positions and is designed to work with a MilSpec diameter,
lengthened collapsible stock, such as the Vltor Enhanced Modstock.
If you are using
the A5 tube as part of the Vltor A5 Recoil System on an AR-15 type rifle or
carbine, it must be used in conjunction with a Vltor A5 Buffer & Spring.
These parts are NOT the same as standard carbine or rifle
receiver extensions or buffers.
to use these parts with standard carbine or rifle recoil systems will result in
damage to the firearm!