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Old 05-15-2005, 10:21 AM   #1
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My Polytech seems to be working now!

Couple weeks ago I posted about the first two shots from my stock Polytech exhibiting flattened and flowed primers like they were way overpressure. Opinion seemed to be that this was being caused by the generous headspace of the Chinese bolt.

I swapped in the TRW bolt last night and shot it this morning. MUCH improved! NO pressure signs from either Aussie or SA ammo, and the rifle functioned perfectly normally--It fed, fired, and ejected perfectly from a Taiwan magazine.

Accuracy only so-so so far, but all shots were well into a 4" aiming square at 50 yards. At least I'm on the paper. The Chinese stock seems a bit loose. My next step is to make the necessary stock filler mod to a GI walnut and GI plastic stock and see which one of them shoots better. Both of them are much tighter fits on the action than the Chinese stock, especially the plastic one.

Thanks to all who have helped and encouraged me with this project to date! I think I'm falling in love with this rifle!
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Old 05-15-2005, 10:27 AM   #2
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IMHO, the synthetic stocks are better then the wood stocks for accuracy. Wood looks much better though.

Glad you know about the chicom connector lock issue. Just glue a short section of popsicle stick inside the stock at the proper location & you'll be good to go. If you don't want to do that, just use a NM spring guide. Even if the connector lock backs out it won't (can't) come loose.
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Old 05-15-2005, 02:38 PM   #3
 
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polytech

Have done exactly what you have i.e. had a TRW bolt put in my Polytech with good results. Also before doing anything to the USGI stock either wood or synthetic try shooting them without bedding first to get a haseline against which to measure your progress. I also have replaced the entire trigger assembly with a USGI one which seem to me anyway to have a better trigger pull. I am sure you know this already about the trigger being a two stage, which I often have to remember to take up the first stage before pulling the trigger. The rear sights if not USGI are often difficult in terms of repeatability and I've replaced mine with a spare Garand one. With Portugese 7.62 NATO at fifty yards I am able off the bench to get two or three shots touching on target and I am not a great shooter. Just keep track of the changes you make and keep of record so you have that baseline to compare too. Good Luck I really enjoy taking mine to the range more than anything other rifle I shoot, and like to surprise the guys with their new SA Inc M1A when they ask me what I am shooting and see the results.
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Old 05-15-2005, 07:58 PM   #4
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The trigger pull on mine is really sweet and the functioning of the trigger group seems fine so I'll probably leave that alone for a while. But I'll keep my eyes open for a good deal on a USGI group if for no other reason than putting that in would up my US parts count and get me closer to being able to put a real flash hider and bayo lug on, which would be cool. The downside is I figure converting to "legal US" would prolly cost me another couple hundred bucks (including the flash) and one thing I like about this gun is how little money I have in it--under $600 so far including TRW bolt, US walnut and plastic stocks, and a couple spare Taiwan mags.

I'm not going to worry about bedding the stocks if I can get say 2.5 MOA accuracy or better out of any of them, which I think is possible.

Even the rear sight on this one seems okay. The very first notch of elevation is a bit slippy but after that it seems very solid. Windage knob is hard to turn but as far as windage goes, I'm a set-it-and-forget-it kinda guy, and I've got this one sorted out already (it needed four clicks to the right and when I shoot it at 100 it might need one or two more, but again I'm gonna wait till I find out which stock it likes best and then set the sights to that stock).

This is a REAL fun rifle to shoot. Wish I'd discovered that years ago and been stocking up on the NATO surp ammo all this time, now it looks like much of it has dried up!
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Old 05-16-2005, 06:33 AM   #5
 
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Quagmire,
Why won't (can't) a NM spring guide pop out if the retaining pin works it's way out when firing?
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Old 05-25-2005, 03:08 PM   #6
 
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The operating rod is actually being held in place by the forward edge of your magazine. That's why it doesn't move as long as the magazine is installed.
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Old 05-25-2005, 04:08 PM   #7
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Quote:
Originally Posted by RGL01
Quagmire,
Why won't (can't) a NM spring guide pop out if the retaining pin works it's way out when firing?
Because a NM spring guide body is wider than the slot in the receiver than the angled tip goes through. It can't slide out when the mag is removed.

I imagine that it is a less than optimal solution, but I know for a fact that it works, and works well.
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