BSA HuMa Regulator Fitting Kit
This is a kit of parts that can help when fitting a HuMa regulator to your BSA. It contains a (long) transfer port that has been pre-drilled to 4.5mm, a softer hammer spring (1.2mm) and a lightweight spring guide matched to suit the new softer spring. The kit offers a saving over buying all the parts individually.
If you have followed the fitting instructions BEFORE purchasing a regulator you would have noticed that you have to drill the standard transfer port in your rifle to 4-4.5mm and that you sometimes need to shorten the standard hammer spring or swap it for a softer one, to reduce the power. This kit allows people, who don't have the means/time to drill out their transfer port or to shorten their existing hammer spring, to fit these parts instead.
- The kits are useful for the BSA Ultra SE, Scorpion SE, Scorpion T10 and newer Ultra MMC rifles,
- The early Ultra MMC and Hornets have a different power adjuster, which does not allow the lightweight spring guide to be used, so the spring guide is not necessary if you have one of these rifles, You would be better off buying the port and spring elsewhere in the eShop.
- The R-10, Hornet and Goldstar SE don't need a larger transfer port, they should already have one fitted and they should already have a soft hammer spring fitted.