Raw hm1000x alternative magazine

I purchased a .30 hm1000x and it came with one mag. One $72 dollar 9 round mag. Mind you I'm not complaining....2k airgun after all. That aside, I've sourced a super cheap alternative. The 7 round gauntlet 30 mag @ $11 dollars. When surfaced down to .672" ish the mag will ride on either side of the action with a slight friction fit. The semi floating pellet probe will align the whole affair and It feeds flawlessly. Even with the inertia of 68gr slugs...no problem. Sizing the mag is simply accomplished with 150 grit paper on a granite plate or counter top. About 10-12 even swipes is all it takes to get around .672" (your mileage may vary). Go slow and test fit last couple of swipes. If you try this post results.