Photo update! Custom SR25/L129A1 Sharpshooter Polarstar!

[Airsoft-Ed]

It's been oooohhhh so long since I actually started a topic, but I think I have reason to today.

 

A while ago now I bought a custom made L129A1 based on an A&K SR25 URX, and since then I have wanted to put a Polarstar into it, because it only came shooting at 300fps and it was a pile of cack.

 

I have skirmished it once and with it only firing at 300fps, the obscene weight of it was just too much considering it's immeasurable crapness.

Well today, the dream became a reality and I finally got a Polarstar into it.



A long time ago I started a topic regarding whether or not fitting a Polarstar into an SR25 was even possible, due to Polarstar Fusion Engines all being standard sizes, but SR25s using longer, 7.62mm style receivers; and obviously a standard V2 and hop configuration would only fill the same space as a regular 5.56mm receiver.

So to get it to actually fit, I had to a buy a G&G SR25 hop unit, and the Polarstar G&G SR25 air nozzle. The G&G SR25 uses a standard V2 gearbox and long hop and nozzle configuration; so that made up the gap you get from using a standard V2 size Polarstar in a longer receiver.

However, the G&G hop didn't fit properly, so I had to remove 4mm from the back of it, which also meant I had to remove 4mm from the front of the nozzle (the highly accurate digital callipers came out).




So with the power of a Dremel tool me and my mate Joe managed to get the length PERFECT on the first attempt, we crowned off the nozzle, rounded the edges to get rid of any sharpness, and voilà.



With a black nozzle we're getting about 425fps at 120psi, meaning it's firing nicely at 350fps on .30s, it may actually be more due to the barrel being a .01mm tightbore, so there'll likely be a degree of joule creep, but we've only chrono'd on .20s so far.
But shooting nicely it is, nicely, for at least 60m with a respectable, rough 1.5ft grouping.

1.5ft actually sounds terrible now I've put it on paper, or internet space...? But without looking through an optic you'd watch the shots going down range and be thinking, "Well, being on the wrong end of that would be shit" because it's only once you see it through a scope that it looks as bad as it sounds, and don't forget, 1.5ft is about as wide as your average person, and most of the grouping was out along the vertical axis, which means it's pretty much down to hop inconsistency.

But! The target was a 6x4" metal plate and mounted about 10m higher than the firing position, so a man ought to be a doddle to hit at around 70m I reckon. But we'll have to wait until the weekend to see how it actually performs in a game situation, the true test will be when there's only an arm visible around a tree at those sort of extended ranges.

Personally I think it'll be better once the hop's had a chance to better bed in, I'm using a Madbull red rubber with the stock nub at the moment, but R-hopping it with an expensive Prommy barrel is very much on the cards at some point down the line.

Before I get the funds for that I'll be trying a much more rigid H nub though I think, since the stock nub is squidgy as all hell, which I don't imagine is great for consistency, and almost definitely the cause of all the fliers.

Not been this excited about using a gun since my first ever purchase

 

 

Oh, and here's a reference photo of the real one it's based on:

[Unrustle_Thine_Jimmies]

That's frickin boss man. I don;' like the look of M4s but the SR25 & other 7.62 versions just look 'right' for me. The L129A1 especially looks great,and that 7.62 Pmag.. Feels good man.

 

You rarely see polarstars or HPA guns in the UK, or Europe for that matter. That Instant trigger response Should feel very nice. How are you finding carrying a HPA bottle? I'ill be very interested in some skirmish gameplay in the near future I hope. There's no beating HPA really in consistency . I heard you can fill the HPA air tank with a PCP air pump with an adapter of some sort,should save some money on going to the scuba/paintball shop for a fill.

[CaptainDumbass]

Lucky son of a......

What did the price add up to with the P*, hpa tank, regulator, line, etc???

[Airsoft-Ed]

I've not played a game with it yet, and the Fusion Engine is actually my mate Joes' haha, he just wanted to see the dream become a reality so bad that he's agreed to share the gun with me lol.

He also works in a diving shop and Skirmish is also a paintball site, so Joe can fill the tanks at work, as well as borrow huge diving cylinders for away games, and when we're at Skirmish we can use the on site compressor used for the paintball guns (Y)

 

One thing that's very satisfying about it is that you can actually feel the recoil It's the lightest feeling ever, it's like being lightly poked by a toddler, but the fact that you can feel it is just satisfying some how. A .3g BB being fired at 350fps or so, is actually producing a strong enough force for the shooter to feel it, I just find that amazing for some reason.

[Airsoft-Ed]

The P*, fire control unit, regulator and 3000psi air bottle and line cost Joe circa £650 with postage.

The G&G hop and P* extended nozzle were around £50 extra on top of that, and the gun was bought as a completed custom build, for what I considered a steal, at £350.

Putting the total cost of the build at around £1050 + the 4 Pmags I bought to the tune of £100.

[Guest PT247]

have just had my HPA tank and hose set up arrive from the USA today with free shipping and no import duty/vat thankyouverymuch Gonna get the tank filled and have a play over the next few weeks getting my M700 running on air before sorting HPA for my G5 with a hi-cap

 

Look forward to hearing how you get on with your set up Ed :-)

[Qlimax]

Where can you buy the fusion engine and bottles for it ?

[Airsoft-Ed]

The Grange sell them, they're the only UK supplier up to now, search for "The shop at the grange" on Google (that's actually what it's called lol)

Alternatively, you can buy them in France for about £100 less all in, but my mate Joe actually managed to get The Grange to price match for him because he bought it at the British Airsoft Show, so I think the fact it was a face to face transaction might've swayed them a bit or something.

[Qlimax]

I thought Patrol base were doing these now as well ? That's the impression I got from there YouTube video, oh and thanks will have a look :-)

[Airsoft-Ed]

Patrol Base can probably get one in for you if you ask them, they're good for that kind of thing.

Today they custom made a stock tube screw for me because I fucked the threads on mine, and they drilled out the hole in my suppressor a little bigger because BBs were hitting it, both for FREE.

I bought 2 bags of .28 Bastard BBs as well, and they gave me a 3rd for free too.

Hands down best service you can get from an airsoft shop. Absolutely cannot recommend them highly enough.

[airsoftwarrior147]

The granges website is suspensionofdisbelief airsoft that will take you to there home page

[Mr Monkey Nuts]

I seem to think patrol base may have one on the wall above the techs cave.

[Dan_W]

Can't wait to see teh epic xXSniperXx scopecam skill shotz XD

[Airsoft-Ed]

With the sort of ranges I'm expecting to get out of this thing, a full blown camcorder with an exceedingly high res and a digital zoom might well be in order, I don't think the Contour's going to cut the mustard when it comes to 40+ meter shots.

Gonna have to stick one on the "Want" list.

[Happy]

Can't wait to see some footage of this in action

[Ian_Gere]

Epicbodgetastic...

[armysurplusandtoys]

looks cool

[Airsoft-Ed]

Tried it out yesterday and it's insanely shite. =[

Shots were going everywhere, over hopping, under hopping, you'd get maybe 1 in 10 shots going exactly where you wanted and the rest would be no where even close. It might be possible to improve it with a new barrel and hop rubber/nub combo, but I think the main issue is that our bodging just wasn't accurate enough.

To sort it out would require buying another hop unit and nozzle to the tune of £50 and then trying the mods again, except I don't know if it's worth it in case we go to far and it doesn't make it any better.

 

=/

Probably going to sell it and use the funds to start an L119 project using a WE M4 CQBR as a base, but I don't have the money for it at the minute, so I'll probably sit on it for a month or two and see if I've changed my mind.

[jcheeseright]

Ahh that's shit news, L119A1 from a CQBR sounds like a fun project though. I know of someone else who's recently done the same and they decided it was better to build it from a full length WE M4A1. The barrel is 2 part and when the extension is removed you get an exact 10" outer.

[Ian_Gere]

+1

 

Not just shit, Marvel's Agents Of Shit.

 

Is the nozzle particular to Polarstar in anything other than name and length?

[M_P]

I think so Ian, they sell different nozzles for different FPS' so I'd imagine they're not standard

[Unrustle_Thine_Jimmies]

I wouldn't give up on it so soon. Check out some yank forums where a lot of Polarstar techies hide. Some guys like 'SilentObvervant' from reddit are really knowledgeable,as is Bingo from Bingo airsoft works. AirsoftMechanics is also a great place to discuss those kinds of issues. There could be a myriad of issues and might be easy to fix. Could be nozzle alignment issues or it could be that the Fusion engine itself is not releasing the same amount of air all the time due to an issue with the poppet valve or something.