AIA, No4, Mk IV - Sept 17 update.

slug

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Sudbury, Ont.
Mine just arrived and the rec room floor is covered with parcel debris. I have several hours to clean up before Her Ladyship returns.

The wood in the butt is very nice. The foreend is nice but plainer. The fit is very good and there are serial numbers over the magazines and front sight block.

The bolt is stiff to operate on my rifle, but with some moly slide, it should get slicker. The magazine bolt hold open is annoying, but I may get used to it. I may convert one magazine so the bolt can close easier.

The bolt has a spring loaded ejector, a la Remington, so ejection should be very positive, unlike the 7,62 conversions, although, it's not really necessary on a target rifle.

The rear sight apertures are quite small, but the sight will be replaced with a Long Branch Mk 1 sight before supper. The front sight post is also quite small, and it is a rotating post to give elevation. If the Ockers were on the ball, they could have made the sight with two dimensions so those of us blessed with aging eyes could have a choice of thicknesses. This will give up some adjustment, but it could be of value to some of us. I'll probably turn down a new front sight when winter comes, unless some bold entrepreneur does it first.

It looks like the receiver can be fitted to take a Parker Hale 5C rear sight. It would require one longer screw to go through the rear sight hole, and a spacer as well as drilling and tapping one hole in the receiver. You would lose about 1/4" of right windage but the P-H has lots to spare. That might be another winter works project.

The cheek piece has two rough hewn and countersunk holes for attaching with wood screws. My plan would to inlet and epoxy two threaded anchors into the butt and attach the cheek piece with socket screws for easy removal with an Allen wrench. The cheek piece is made from an underwhelming piece of scrap teak, but seems very comfortable for scope use.

The butt plate looks like grey cast steel, but if I can, I'll try to find a nice brass one in my junk pile, and polish it up and replace the plain one. The large target sling swivel in front of the magazine can get in the way and will be replaced.

My biggest beef is the lack of charger guides. I would rather be able to load from the top with chargers, than have a spare magazine. I can see a trend to customizing these rifles a bit, not to the extent of the M-14 Norcs, but enough to be interesting. I can envision an enterprising machinist setting up to cut charger slots in these rifles, although it could require relocating the rear scope mounting hole.

The bore is bright and shiny, and I want to sneak out this afternoon to try it. However, my only ammo around here is Federal Gold Medal Match, and I want to keep this rifle strictly for cast bullets. No condom bullets are going down this bore.

Overall, I'm very satisfied with this rifle as it looks quite interesting, and interesting is one of the nicest compliments that I can pay about a rifle these days.
 
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slug said:
The bore is bright and shiny, and I want to sneak out this afternoon to try it. However, my only ammo around here is Federal Gold Medal Match, and I want to keep this rifle strictly for cast bullets. No condom bullets are going down this bore.

If we were going to get an accurate (no pun intended) report on how these things group, this is would be the stuff to use........No pressure......;)
 
No 4, Mk IV

Due to popular demand, (I guess beltfed is popular) I went out to try Mk IV with my last box of Federal Gold Medal Match ammo.
One shot for sighting at 50 yards and then a five shot group. It was 3 & 5/8 inches at 100 yards - not very encouraging. My next four were in a straight line at 1 & 7/8 inches. Much better.
Perhaps I was handling the recoil better with the second string, or maybe the Li'l Darling needs to settle down a bit.
I had left the two legged sight on, just to try it. The narrow front sight is not that bad for shooting at a paper target. I use the fifty yard pistol targets and they work well.
I'll use the Mk I backsight for my last ten rounds. The headspace on my RCBS Precision Mic shows that the fired cases are just two thou over minimum.
It looks like they took good care in fitting up this rifle. It may not chamber some of the rougher milsurp ammo out there.
It's awkward to load single rounds in the magazine from the top. It will probably be easier to insert loaded magazines. Feeding was a bit awkward but that will loosen up with time, I'm sure. I had one loaded round hang up while feeding.
All in all, it's not a perfect rifle, but it has potential and it will see lots of range time in the future.
 
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Maybe the groups will tighten up once the barrel is broken in? In any case, thanks for the report! :beerchug:
 
Seems like a few gunnutz are picking up these repro's. Glad to hear it's satisfactory and not just a ###y looking gimmick.
 
AIA Mk IV -Sept 11 update

Back again. I decided to mount a scope on the Mk IV and my biggest problem was getting out the locking pin that secures the rear sight axis. The metal was a bit soft and the fit very tight. Tapping the bottom end of the pin merely peened the pin a bit bigger and larger than the hole through which it must pass. I finally got it part way out and removed it with a large pair of vice grips. I had to remove the rear sight before I could mount a scope. Just be forewarned.

I installed a Bushnell 10x with mil-dot reticle - very nice. After, I had it targeted at 190 yards, the first 5 shot group was 3 & 3/4 inches, which wasn't too impressive. The recoil was noticable and I hadn't installed the cheek piece so shooting was slightly awkward.

The second group was 4 & 1/4 inches with one called flinch. The other four shots were into two and 3/4 inches which was much better. Three of them were in one inch. This rifle does have some potential.

I ran some of the fired cases through a case master tool, and the neck runout seemed to be between seven and eight thou. That seems a bit sloppy but the cases could have been distorted during ejection. However the fired case bodies, both near the shoulder and base, had runouts of about one thou. This is excellent, showing that the chamber is very round.

The trigger pull on my rifle is consistent at six pounds; a little heavy, but certainly manageable. I put Moly Slide on the bolt and it has smoothed up a bit, but still has a ways to go yet. I had another hangup in feeding this time as well.

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I have only fired twenty-five rounds through this rifle so both it and I are still learning. This was the last of my Federal Gold Medal Match ammo. We'll have to see what reloads can do next. I may have to get a separate one just for cast bullet shooting. This rifle has good potential and I would have to give it about four and one-half dancing bananas.
 
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I'll bet load development will help it along. Also, the barrel likely need breaking in and you need to adap to the rifle's trigger pull. I doubt it's MA out of the box though... thinking of bedding it at all?
 
AIA m10

Thanks very much for your post. I have one of these on order (the Jungle Carbine-style short version) from Wolverine which should be here any day now, and the anticipation is high! I just about broke my finger on the keyboard when I jumped on your post!

By the way, I love your signature line!:)
 
Thanks for reviewing the Australian International Arms M10 No.4 mk.IV rifle. While I'd never expected people to talk about these rifles in terms of dancing bananas, here's hoping this becomes a humourous tradition when reviewing any firearm.

All three models are proving rather popular thus far with the No.4 mk.IV and B2 Match being the main choice of miltiary rifle enthusiasts (no major surprise there). These certainly have a great deal of character when compared to the large number of synthetic stocked rifles in sporting type configuration that are in the same price range. The M10 has much the same appeal with its Enfield action, vintage styling, and exotic wood furniture as a well-made mechanical watch or clock does to some.

Please do work up a load for your rifle. It will be great to see how it performs with 'fire formed' brass and a good piece of glass on the picatinny/weaver scope rail.

- Peter
 
SLUG;
Thank you for your test report, we welcome ALL reports on this line of rifles.
We want to hear ALL comments, god, bad or indifferent....
Please contact me privately at john@marstar.ca would like to discuss something with you

Regards John
 
Mk IV update

I had twenty-five fired Federal Gold Medal Match cases to reload. I sized ten of them with a Lee Target Model Loader and neck reamed them. This model has been discontinued for about fifteen years, but occasionally may be found on eBay at a reasonable price. They are fiddly to use for neck reaming, but they ream from the inside of the case neck while the outside is fully supported by the sizing die. It also reams the whole neck and you don't have to worry about cutting into the case shoulder which may happen with outside neck reamers.

The other fifteen were prepped with a Lee collet neck sizing die. Two of the cases were crushed in the die. More on that later. They were primed with Federal Gold Medal Match primers and loaded with hand weighed charges of 44 gr. of Varget. The Lee manual lists the overall cartdidge length at 2.810 In. and I went a bit longer at 2.815 in. The factory Federal ammo is 2.802 in. The bullets were Hornady 168 gr. HPBT moly coated. There was only slight resistance on closing the bolt, but there were no marks on the bullet, so that wasn't too far out. I used a Hornady New Dimension die, with the sliding collar for bullet seating.

I was at the range at 7:15 this AM, and it was overcast with no wind. I was shooting at twenty yard pistol targets at 190 yards, which have a 3 & 3/4 inch aiming mark, which seems pretty small, but through that nice Bushnell 10X, it's actually too large.

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The first group was five shots with the neck reamed cases and it gave a group of 5.40 in. I've read that moly bullets need a bit of seasoning before they shoot well.

The second used neck sized cases and gave 3.09 in. Much better.

The third group with reamed necks was 1.83 in. Wow.
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The fourth with neck sized cases was 4.24 inches. On my last shot, the rifle jammed and this may have distorted the cartridge causing a flyer. The other four shots were in 2.11 in.

The magazine is scheduled for a bit of out-patient surgery, however the bolt is a bit slicker now.

The two crushed cases were a symptom of another slight problem, the neck of the chamber. As I previously related, the neck runout was about .007 in., which I thought was a bit too much. I also measured the runout on my Remington Varmint Synthetic and Parker Hale 1200TX, both in .308, using ammo from the same batch. The VS had a runout of .002 and the PH had only .0015.

I also measured the outside neck diameter of the fired cases. The AIA was about .348 in, the VS was .344, and the PH .345. So the neck of the AIA chamber is a bit larger than the others, and that would explain why some cases wouldn't fit into the collet of the Lee sizing die. If case necks are thinned by neck turning, there is a chance that there may not be enough neck tension to hold the bullet consistently or the neck of the cartridge may be a bit sloppy for the chamber neck, however the third group showed that neck turning did no harm in this case.

Take courage, my fellow leadheads, I'm coming back from the dark side, and will be shooting cast bullets again soon. What would my sainted mother say if she knew that her son was shooting bullets with condoms?

As always, comments, complaints, and criticisms are welcome.

The saga continues.
 
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