gatnerd

Military Guns and Ammunition

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This is intended for people interested in the subject of military guns and their ammunition, with emphasis on automatic weapons.

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FN SCAR Mk 2 and Evolys   Small Arms <20mm

Started 14-Apr by Guardsman26; 7869 views.
mpopenker

From: mpopenker

18-Apr

yes, as it allows placing the belt feed unit above the barrel breech

Just look atthe Polish UKM-2000 machine gun which is, basically, the PKM mated to MG-42 belt feed

nincomp

From: nincomp

18-Apr

gatnerd said:

Regardless of what word he used, he's describing the bolt bouncing off the rear of the receiver, adding a bit more power to the bolts forward stroke then spring power alone. 

Some buffers can also add power to the forward stroke.  A spring type can prevent solid impact with the rear of the receiver,  if it is not fully compacted at the end of the bolt's travel, then use the stored energy to accelerate the bolt forward.  The amount of energy returned to the bolt would likely be higher than if it had impacted the rear receiver.   A hydraulic buffer can also return energy for forward bolt motion, although by design, a certain fraction of the energy has been absorbed.  Nevertheless, since a hydraulic buffer, like an automotive shock absorber system, can be combined with springs and valved for relatively high damping in compression and low damping in "rebound",  it can return a significant amount of energy to accelerate the bolt back to its original position.

roguetechie

From: roguetechie

19-Apr

Yeah that one, I'm not an engineer I just play one on tv lol.

I'd love to be better educated than I currently am, working on it but there's so mucg to work on so little time.

roguetechie

From: roguetechie

19-Apr

What baffles me about that is both the Chinese and arsenal Inc can and do make rimless pull feed 308 pkm's. 

There's even ways to do that with a disintegrating link, and the impetus to do so since NATO/American standard push through links aren't all that light efficient or otherwise favorable.

It makes much more sense to me to just keep the pull feed and design a better cheaper and lighter disintegrating link

smg762

From: smg762

20-Apr

Are you an actor IRL?

roguetechie

From: roguetechie

20-Apr

Lol no, I did some PA work on tv shows long ago but I'm definitely not an actor.

I'm just an eccentric gun nerd who likes to tinker in his basement ...

I used to want to be something more but recently I've decided there are worse things to be than me.

Guardsman26

From: Guardsman26

25-May

Fired 6.56 mm and 7.62 mm Evolys today. Hugely impressed.

 

njb3737

From: njb3737

25-May

Did FN UK give any information on future developments in their rifle range - will we see a ‘new’ SCAR variant ( apart from the NRCH ) ?

 I got some hands on at DSEI of Evolys and also was impressed with it , crazy light in the 7.62 version yet solid feel .

what did the British Army guys think ?

Apsyda

From: Apsyda

25-May

Did you do any sustained fire testing, or just burst fire for demonstration? Curious how that light barrel does.

I assume it was a very smooth shooter, yeah?

Guardsman26

From: Guardsman26

26-May

The SCAR Mk 2 already offers several improvements that improve it, including a non-reciprocating charging handle.  FNH has also adjusted the damper rates on the return spring, further softening felt recoil for both versions. There will definitely be a Mk 3 and the Mid-Range Gas Gun (MRGG) shown at SOFIC and MDM exhibitions last week shows the direction of travel. As things stand, you could adopt Mk 2 SCAR today and you would have the best non-AR15 5.56 mm rifle currently available IMO. 

With Evolys we fired 800 rounds from each gun over three hours. Any gun in any calibre will start to overheat after 250 rounds have been continuously fired. By firing controlled bursts with 2- or 3-minute pauses after each 50-round or 100-round belts meant that both guns could carry-on firing without a barrel change.

The really clever thing is the one-piece aluminium receiver. This is every bit as strong as the riveted body of the MAG58, but it has a hydraulic buffer which absorbs recoil allowing light weight and controllable recoil to be combined in a single weapon design. 

Looking forward to seeing SCAR in 6.8x51 mm.

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