In terms of Rifle Grenades, I had an idea awhile back to make them multi functional. Lets call this the 'MPG1' - for multi purpose grenade.

Basically, a rifle grenade form factor, but with 'dual fuse' ability so that the MPG1 could be used either as a rifle grenade, or as a hand thrown 'stick grenade' ala WW2 potato masher. 

That seemed like it could be pretty handy.

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Seems like it would be a very poor form factor for a hand grenade.

Significantly heavier and much bulkier than current hand grenades.

Nothing bigger than a modern hand granade is going to make sense. 

Just compare a potato masher with a small drone with an optimized (non improvised) grenade or a smaller suicidal drone. The later can go through windows and doors, and the former is making the lives of the people at the front a hell right now. Specially by night

As a matter of fact, the German 30 mm HE rifle grenade of WW2 in the beginning could be used as a hand thrown grenade.

This feature was later dropped, possibly to simplify manufacture. I am not familiar with reports on the use.  

You almost stumbled upon an idea I've been kicking around...

What if you have a potato masher/fn bullet thru style "rifle grenade" (only maybe a bit bigger) that has a single folded coaxial rotor which deploys the motor using a simple air speed sensor that kicks the rotor open as soon as it stops accelerating/gaining altitude from either being thrown or being launched.

By using a single coaxial rotor like that and not needing the full power to take off or start from a dead stop you could use a much smaller motor to charge size ratio giving you more flight time/range.

It could actually make for a decent little weapon

Apsyda said:

https://www.gao.gov/docket/b-420766.1

https://www.gao.gov/docket/b-420766.2

Both GAO protests were withdrawn by TV via Lone Star. As expected they didn't go anywhere in the end.

I suppose that means that SIG really did at least fit the standards asked for by the Army, if not definitely being the best rifle. Shame the protests didn't go further on the off chance some interesting trials info could have been released.

Well, time to commence the 3+ decade wait until we can FOIA the trial results to find out what really happened to the Textron entry, just like ACR before this

https://www.youtube.com/watch?v=WQnaTrLROCE

RAROG's plastic machine gun belts. useful for the future?

Ukraine's Plastic Machine Gun Belts -The Firearm Blog

Looks very useful for 7.62x54R, but it is a different link design than used with 7.62x51 and 6.8x51.

Pull-out rather than push-through does make more sense for plastic link. I’ve seen plastic M13 link but apparently it’s not as robust as the metal. Not really a surprise.