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Thread: Genuine R4 rifles
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23-10-2016, 10:45 #21
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Re: Genuine R4 rifles
Here's a pic of the Nobleteq gastubes they were selling for LM4-6 rifles. You will notice the LM4 tube has the flange where the LM6 tube is likely a cut off LM4 tube.
A lot of the locally made parts I have seen have a diamond mark on them. You also see this on the locally made mags.
There's a very informative thread on the Galil vs R/LM differerences here http://www.uzitalk.com/forums/showth...s-of-pictures)
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23-10-2016, 10:48 #22
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Re: Genuine R4 rifles
I have come across two reasons for the ring around the gast tube.
1. For re-inforcement. I think the SA made gas tubes are thicker than the IMI made gas tubes. A dent to the gas tube would render the rifle inoperable.
2. There were reported instances of the locking lever on the Front Handguard Holder Assembly (No 5 on the exploded diagram) working loose under automatic fire, which in turn would loosen the gas tube. With the ring the locking lever can only move so far, but not become completely loose.
I can't remember where i came on these explanations, but they have stuck with me.
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23-10-2016, 11:16 #23
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23-10-2016, 12:40 #24
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23-10-2016, 12:54 #25
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Re: Genuine R4 rifles
The handguard has no bearing on the gas tube. The gas tube is kept in place by the dust cover and can only slide back when the dust cover is removed (or damaged).
The gas tube ring does indeed prevent the handguard locking lever from loosening. I have never seen it loosening itself, but since it's kept in place by friction alone, that's a real possibility, especially under hard use and frequent cleaning. This was the reason for the change then.
I think the ringless gas tubes on the LM4's were simply old stock, that they used on the LM's since they were very unlikely to ever experience the problem.
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23-10-2016, 13:02 #26
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Re: Genuine R4 rifles
Will see what can be done.
My LM6 has the A2 mark on the barrel, under the handguard. (Serial no. on the gasblock.) It can with a floating firing pin with relatively large tip. Works great with milsurp Berdan-primed ammo, even the hot loads. With Boxer primers it frequently punctured the primers and the pieces of primer cup tend to blow into the firing pin channel and jam it. Jammed back, it doesn't fire, jammed forward it goes buurrp... Not nice during a match!
I obtained a bolt with smaller diameter sprung pin. Works perfectly so far, no piercings.
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23-10-2016, 15:57 #27
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23-10-2016, 17:26 #28
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23-10-2016, 18:32 #29
Re: Genuine R4 rifles
[QUOTE=WCC;1106356]Here's a pic of the Nobleteq gastubes they were selling for LM4-6 rifles. You will notice the LM4 tube has the flange where the LM6 tube is likely a cut off LM4 tube.
My 6 has a tube like the centre one.We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm -George Orwell
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24-10-2016, 09:14 #30
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Re: Genuine R4 rifles
I got a spare tube to be modified a little for my LM5 and it looks like the tube on the right, in WCC's pic above. It was probably a LM4 / R4 gas tube cut down.
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