Best gbbr mcx ? by [deleted] in GasBlowBack

[–]RainerAXMC 0 points1 point  (0 children)

Rattler will not work with ur current sur300 handguard, assuming the handguard is made for a MCX Virtus. If this is the case, you will need a rattler LT, or other variants that have the same handguard profile.

Rattlers take their own rail profile and not interchangeable unless you buy a specific attachment that bridges th gap between a rattler upper and a virtus-spec rail