I held my 53 for the first time on the 25th and I asked about the flash hider. It has a spring clip that locks into the notches once it is fully seated. Basically stops it from spinning off during vibration.Does the 53 flash hider lock onto the barrel with the internal spring pin? Or is it supposed to thread on freely and the grooves on the barrel and the internal spring pin just offer resistance? Thanks.
M855 is the ammo I have readily available.4-prong, definitely.
Even the birdcage has the slots which will allow you to see the flame front as it exits the muzzle. With the 4-prong, you only get a slight glimpse of orange flame, and it's mostly out the front.
This all depends on what ammo you're shooting, too, I might add.
I haven't had any issues of a 53 flash hider coming loose... ever. Hand pressure only. And the only 4 prong hiders I have heard of that break over time are the US made "extended" 4 prong thingies.Most of the HK line you only have to snug the muzzle on. On the 53 you should make sure it is tight. The 53 four prong hider has a tendency to resonate and fracture one of the prongs over time.
The flats on the hider are for removal. Doesn't mean you should tighten it using the slots. Grunts used to remove the birdcage hiders using a bayonet blade, don't think 53 operators really had any "bayonets" issued, hence the wrench slots. Every Hans, Fritz und Gretchen has wrenches somewhere...There is a spanner slot on the hider to aid in removal. The Fleming 308 HK51 hider also should be tight. My brothers Fleming 51 came loose to the point where a round nicked it on the way out and it flew down the range 20 yards. The only way we knew this is suddenly the gun began to belch rings of flame (This is how the ring of fire flash hider came into being)
The Volmer 51B muzzle brake is infamous for coming loose after 100 rounds
or so. But then again so do your fillings in your teeth.