This product is NOT compatible with the SpecnaArms SA H416 A5 QD spring-guides series.
The shape of the spring guide has been modified compared to those ones found on the market, the main shaft has been elongated and slightly enlarged to provide greater stability to the spring during pre-compression and release even at high speeds, while at the top there is a progressive narrowing of the shaft that makes it compatible with all the springs on the market. We recommend the use of the TopMax QD spring-guide with the TopMax's RCS_it springs having been designed to achieve a perfect pairing.
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