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Are the factory FX M3 dual transfer ports equivalent in airflow efficiency to Humas's Dual Transfer Ports or do the latter really have an advantage over the factory supplied ones?
I changed my .22 out with a Huma when I installed a heavy slug liner and slug power kit. Here’s a photo of the size difference. Huma is on the left. I can’t say it made a difference since I made several changes at once . My main concern was with the pellet port on the other side of the stock and the Huma does not have that.