HK SL7 Anyone have or seen one?

Hk Sl 7

If you read the HK pages, they say its a modern G43....it sure looks like a military weapon, and comes with a military mount and scope...
but ok...
 
I nearly bought one a few years ago, I regret not picking it up. They appear from time to time at gunshows but they generally go for about a $1000 or more.
 
the SL7 has the internals of the HK91. Wouldn't this make it prohib?
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If they actually cared about that, yes... But it looks like a hunting rifle, hence its ok.

If you painted in black, put a barrel shroud on it, and a magazine, they'd ban it in a heartbeat.
 
I think the HK Pro Aritical is wrong, or they share a few common subcomponents.

Tell me how this type of gas system:

g3old.jpg


In this type of firearm:

sl6.jpg


The HK G3 Family of rifles use a gas system that relies on a upper "tube" as you can see to carry the piston etc in. The SL6 & SL7 lacks this. And as you can see the trigger unit is also different based on the position of the safety and the trigger itself.

Dimitri
 
Sorry to have to say you are wrong, but there is no gas system. The tube holds the cocking handle . H&K uses "delayed blowback", and the only "gas" related design feature is a fluted chamber to aid extraction since the cartridge case is still slightly pressurized when the bolt begins to open.
 
Dimitri said:
PaulZ,

In that case the G3 family of rifles operates alot like the 1911 pistol I take it?

Dimitri
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Not really, more like a WWII German machinegun. The bolt is never actually "locked" as such. There are a pair of spring-loaded rollers that are forced into recesses in the side of the receiver/barrel extension. When the weapon is fired, these spring-loaded rollers resist the opening of the bolt for a couple of milliseconds until they are forced back into recesses in the bolt.

In a blowback pistol (PPK etc) or any WWII submachine gun, the only thing holding the breech closed is the weight of the bolt and the power of the recoil spring. Gas pressure in the barrel/chamber pushes the bullet out the front, and the casing out the back. In a sense, the empty casing is being used as a "piston".

Since the combined weight of the now empty casing, bolt and spring is heavier than the bullet, it moves backwards more slowly than the bullet moves forward. The bullet has left the barrel and the chamber pressure has dropped to a safe level before the casing is extracted more than a few millimetres from the chamber.

This only works for low powered pistol cartridges. When you move up to a rifle sized weapon, the power is greater, and the weight of a bolt heavy enough to hold the breech closed til the bullet has left the barrel would be ridiculously heavy. So some mechanism has to be found to increase the resistance of the bolt to being opened, just long enough for the bullet to leave the barrel and the chamber pressure to drop to a safe level. The rollers don't lock the bolt closed, just hold it closed a little longer, hence "delayed blowback".

I hope this explanation isn't too convoluted. Anyone out there with a better way to explain is welcome to jump in!
 
paulz said:
Not really, more like a WWII German machinegun. The bolt is never actually "locked" as such. There are a pair of spring-loaded rollers that are forced into recesses in the side of the receiver/barrel extension. When the weapon is fired, these spring-loaded rollers resist the opening of the bolt for a couple of milliseconds until they are forced back into recesses in the bolt.
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The MG42 was actually short recoil operated and roller locked, the G3 is roller-delayed blowback. The rollers themselves in the G3 are not under any spring pressure but pressure from the forward pushing locking piece, which displaces the rollers into locking recesses in the barrel extension thanks to a carefully calculated geometry. I've been reverse-engineering this system on some CAD software and it is a very clever exercise of mechanical engineering prowess.
 
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Dimitri said:
PaulZ,

In that case the G3 family of rifles operates alot like the 1911 pistol I take it?

Dimitri
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No, the Browning camming action uses the short recoil of the barrel and slide to tilt the barrel upward and slide into a locking block in the slide (usually the ejection port).
 
koalorka said:
The rollers themselves in the G3 are not under any spring pressure but pressure from the forward pushing locking piece, which displaces the rollers into locking recesses in the barrel extension thanks to a carefully calculated geometry. I've been reverse-engineering this system on some CAD software and it is a very clever exercise of mechanical engineering prowess.
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I stand corrected. Thanks for that. I knew if I posted, somebody who knows more would be right along to help:D
 
Rico
SL6 and SL7 where sold to several South American countries specificaly police depts,. I have shot 1 in 223 nice rifle , every once in a while they show up will keep a look out for one at the Gunshow in Calgary for you
Wayne
 
I owned one for a year or so back in the late '80's, and sold it for more money than (I thought) I could refuse. I still regret selling it :(, but looking at the cost of accessories now, I'd have to make a choice between buying a couple of mags or sending my kids to college...:D


blake
 
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