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9/22/2017 12:11:25 AM
Posted: 8/29/2005 5:01:56 AM EDT
I am ordering a JLD PTR 91 A1 with flash hider and I had a few questions. Which are the best magazines to buy for this weapon, steel or aluminum? Are HK factory magazines marked clearly?
Also, can these weapons shoot .308 and 7.62 ammo? I was under the impression that .308 can develop higher chamber pressures and therefore unsafe to shoot in a 7.62 weapon. Are there any .308 loads that are safe to shoot in a weapon such as this, are should they all be avoided?
Thanks for the help, I cant wait to get this gun and build it into a MSG type clone.
Link Posted: 8/29/2005 6:09:26 AM EDT
[Last Edit: 8/29/2005 6:14:24 AM EDT by cobrasks]
Most shooters I know prefer the aluminum.

Mostly for 3 reasons.
1.Their cheap !$3.00 /mag for new ones from RobertRTG.com.
2.If you ever plan on actually carrying your mags in some type of
equipment ,aluminum is much lighter.It's very noticable if
your carrying 6 mags or more.Also ,HKs are heavy.
Any saving in weight is appreciated if you ever have to carry it
for long distances.
3.Aluminum doesn't rust.

The steel are still good.They are stronger and often fit more snugly.

I just think the above reasons for choosing the aluminum far outweigh the
reasons for using steel.

You should be aware that the PTR-91 A1 has the plastic lower.
For a smooth trigger pull ,you will still need a trigger job.
Some who have purchased the A1 thought the plastic lower would
automaticly give it a better trigger pull.It just lightens the

As for the ammo question,anyone correct me if I'm wrong ,but I
understood it as being the opposite.
The 7.62 mm has higher chamber pressures than the .308 .
Hence why you can use civilian ammo in a military rifle,but
manufacturers warn against using military surplus 7.62 in
commercial .308 rifles.

Either way ,I use both without any problems in my PTR-91 PBWB .

If you intend on using .308 ammo,I recommend making sure
the ammo you use has pointed tips (PSPs) to make sure you
don't have any feed problems.

I've used .308 in 150 grain PSPs to 180 grains.
I like the 150 PSPs because they closely match most
surplus 7.62 in performance.(cheaper practice)

Oh ,
DON"T USE INDIAN AMMO !It's freaken dangerous.
Headstamped OFV.
Other surplus varies in quality ,but isn't outright dangerous like OFV.
Link Posted: 8/29/2005 8:44:35 AM EDT
I like steel ones better, but it's hard to knock the alloy mags for $3 or less.

A lot of the steel ones I've seen have had some rust one them. Back when the mags were $25 for used alloy, and as much as $60 or more for nice steel ones, none of the steel ones I saw were rusty.

Another tip about ammo. DO NOT use CAVIM. It's Venezuelan or Argentine 7.62, and has a tar like sealant that really gums up the fluted chamber. If you fire a number of rounds and leave one in the chamber long enough to cool, the tar will practically glue the round in the chamber.

If you call Robert RTG. You can the surplus mags he has for 1.80 each in bulk.

I'm about to order about 20 or so from him now (and I havne't bought my PTR yet )
Link Posted: 8/29/2005 12:38:08 PM EDT
[Last Edit: 8/29/2005 1:10:19 PM EDT by TxRabbitBane]

You should be aware that the PTR-91 A1 has the plastic lower.


What parts of the receiver are plastic?

This is (potentially) alarming.

Could you post some more info on this?

EDIT: I looked at the pictures on the website and see what you mean. I wonder how this effects durability on the A1....
Link Posted: 8/29/2005 1:25:07 PM EDT
I'm not to into an all plastic lower myself !

I wouldn't want the plastic lower only because of the parts count issue.

The plastic lowers are all foreign ,and the pistol grip and the
trigger housing are one solid piece.
That means using the pistol grip itself as a cheap and easy US part
isn't happening.
If you ever plan on changing any parts with foreign ones,it
wiill be even more difficult.(like a foreign butt stock)

On the plus side though ,the PTR-91 A1 comes with the wide forearm
already ,and that's the part most people change anyway.
I've heard the plastic lowers weigh nearly a pound and a half
less than the metal frame lower.
I have no idea if this is true ,I've never weighed my steel frame one to even
see what it weighs.
Link Posted: 8/29/2005 1:26:21 PM EDT

Originally Posted By TxRabbitBane:

You should be aware that the PTR-91 A1 has the plastic lower.


What parts of the receiver are plastic?

This is (potentially) alarming.

Could you post some more info on this?

EDIT: I looked at the pictures on the website and see what you mean. I wonder how this effects durability on the A1....

Considering the G3 has been built with the plastic trigger housing for many years now, I don't think it should be a problem.
Link Posted: 8/29/2005 2:05:26 PM EDT
The "Navy lower" used on the A1 is the same semi-auto one made by Top-Notch,U.S. made.
Link Posted: 8/29/2005 5:03:27 PM EDT
No problems with any kind of warping due to heat, etc?

Don't want anything busting my "I gotta get me one of these" bubble =)
Link Posted: 8/29/2005 10:15:19 PM EDT
I'm also interested in a response to the ammo question in this thread as I'm thinking of getting one of these rifles......
Link Posted: 8/30/2005 5:49:37 AM EDT
I have a plain Jane PTR91 with a 18 inch barrel and flash suppressor and it does not have a plastic lower trigger housing. The plastic that was referred to above (and correctly ID'd above) is the Navy style. This Navy option does not come with the standard PTR91. If in doubt, call JLD directly.
Link Posted: 9/5/2005 6:21:06 AM EDT
Thanks for all the good information, everyboydy. I assumed that 7.62 would have higher chamber pressure than .308 but two internet reloading sights said that the reverse was true. One source explained that .308 doesn't always have more pressure than 7.62, only that it may. I personally love the way the plastic lower looks/feels. The grip, ambi controlls and pictographs are much more appealing to me than the older lower. I also like the trigger much more than the older one. I will have to shoot it and see if it needs some mods. The A1 seems like it may suite me better than some others as it will give me the option of having an awesome battle rifle or the ability to easily make it a pseudo precision rifle. I was under the impression that the term "Navy" lower refered to the way the Navy equips thier MP5's with just safe. semi and full. I did not know that the term Navy lower was a generic way to describe the newer plastic lowers.
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