Have been doing a bit of experimenting with a Bula Defense Systems XM21 with Bula med weight NM barrel bedded in MacMillan M3A stock with Leupold MK 4 16x fixed on ARMs #22 quick detatch rings. Harris bipod is attached to Macmillan button mount. Have noticed no change in function or POI with or without suppressor which is an OSS HX-QD .338 Magunum TI. Ammo 150 gn Berger fb over 41.5 gn of IMR-8208 XBR. I am very happy with sub moa 10 rnd groups at 100 yds. Whatta Hobby!

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