[Kenny Bunk]

So can the fellows retro-fit the Ospey system to their M$s and 16s w/o getting in a heap'o'trouble? Sounds like a natural for sandy gritty places to me.

Also, what is going on with the 6.5 Grendel-6.8 Rem options? I am a big fan of 6.5 stuff, having been killing things, including big things, with my trusty surplus Swede Mauser since they were available mail order back in the pre-Kennedy Jurassic Era.

[MHGinTN]

Sorry, don't have a definitive answer for you. I would guess that altering in a significant way a piece of government issued equipment could get a soldier in trouble, but our troops armored up their vehicles to save lives and it became policy, so I just don't know. It would not be a difficult retro fit however. Pull the gas tube, insert the cup into the gas block, attach the piston and rod, chnge the bolt carrier and use the existing bolt in the OSprey carrier. Military issue have longer barrels so dwell time would not be a problem for altering buffer springs. But I just don't know if it's allowed.

[MHGinTN]

BTW, I would think a 300 AAC would be a better transition round since existing mags can be used after switching the barrel/firing chamber out.

[Squantos]

You can swap uppers easy to any. Caliber piston or not. Works very well grendel or 5.56 etc...

My favorite carbine is a 96 mauser as well KB. Paid 80 dollars for it an a old SF armorer had cut it down to carbine lenght bbl aka 18.5 inches. Added a cheap 6-18x tasco snagged at big box store for 20$ and a sling from an old garand made this a 100$ favorite. Favorite OTC load is 140 gr Alaska Norma makes. They have a heavy 156gr also but the 140gr is most accurate in my kitchen bench carbine.

Stay Safe !