Maple Leaf MR Hop Silicone Hop-Up Rubber — VSR and GBB

Silicone behaves differently to the standard nitrile compound. It stays pliable across a wider temperature range, which matters on a gas gun in winter when a stiffer rubber starts to feel inconsistent over the first few shots of a magazine. It also stands up better to the heat and wear of a hard-cycling blowback.

The degree marking is the hardness of the compound, not the amount of hop applied. A lower number is softer and suits lighter BBs and lower power; a higher number is firmer and holds its shape under heavier weights. Most gas users land between 60 and 70 for typical skirmish loads.

This is the silicone line specifically. Maple Leaf also produce the MR Hop in their standard compound, and the two do not feel the same even at an identical degree marking.

Specifications

Good to know before you buy

Re-set your hop adjustment after fitting. A change of compound moves the sweet spot even when the degree number matches the rubber you took out. Seat it fully against the barrel window before closing the chamber.

Frequently asked questions

Which degree should I pick? Match it to BB weight rather than to your gun. Lighter BBs sit better on a softer rubber; heavier ones need a firmer one to stop the lift collapsing.

Is silicone better than the standard rubber? Different, not better. Silicone holds up to heat and cold more predictably; the standard compound has a grippier feel that some shooters prefer in mild weather.

Will it fit my hop unit? It suits VSR-pattern chambers and the gas platforms listed above. Check the chamber takes a VSR-spec bucking before ordering.