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 ready to start making chips - compact barrel suggestons?

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kragaxe
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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Thu Sep 12, 2013 11:58 pm

Here's the final contour of the front guard. I'll add the lower mounting point and two small rails next week.



Got the barrel in while I was out. It looks great. Perfect timing, too. I had a really crappy day at work so I needed to take out some frustration. I took the new barrel out in the backyard with a variety of paint.

It shoots the Draxxus Professional great. About one in eight fly off randomly spinning out of control. About a 12" group at 65'.

The X-treme shot poorly and the Draxxus Midnight was horrific. Both of those just fall right through the barrel where the other one needs a good breath of air to send it down the barrel.

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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Fri Sep 13, 2013 3:32 pm

Looking REAL good!  Keep it coming!
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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Thu Sep 19, 2013 5:29 pm

yeah you have to watch your specific bore,.. every paintball make is different,.. i think we had a chart around here somewhere,.. BRB *runs off*



*BURSTS back in, Cosmo Kramer Style*

Got it!!!

click here for barrel bores and paint bores


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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Sun Sep 22, 2013 2:30 am

Got it all finished up. Here's the steps to finishing it out. It was a little more labor intensive than I first thought, but it turned out well and was a good learning experience. I'm sure it won't be the last one I do. My son has an A5 that's begging for some work!

First thing was to do the spacers that hold the main guard and barrel shroud concentric and the shroud and barrel concentric. I used my dad's little Harbor Freight lathe to do the work. Aluminum cuts pretty easy. I pretty much took it down close, then took 0.002" off each pass until the barrel fit in it with a single layer of aluminum tape to prevent scratching up the muzzle. The guard and shroud were done with a snug metal on metal fit.




 
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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Sun Sep 22, 2013 2:42 am

Here's the guard fit with the shroud and the spacers. These were a press-fit, set using a 20 ton hydraulic press...no need for set screws here!




Next is all the parts laying together. You can see how they all will fit together. I didn't press the end cap in yet for the pic.






Once I got all the spacers cut it was time to finish out the front guard and make the attachment stub and rail. Unfortunately, I didn't have any convenient sized aluminum bar stock. I have several blocks of 6061-T6 aluminum though, so I cut the rail block blank out of one of those. The rail and attachment stub are integral. This wasn't really preconceived design. The size of the guard tube and where the stub needed to be just made it so I had to do it as separate pieces, but it worked out well in the end.

I will never bitch about the price of picatinny rail blanks any more! What a pain. I used a cheap harbor freight 45* router bit to do the angles/bevels. It actually worked well as long as I lubed the crap out of it. The only thing I plan on mounting here is a grip, so I only cut half the cross-cuts.





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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Sun Sep 22, 2013 2:59 am

The rail was attached using 4-40 screws and nuts on the inside of the guard. These were torqued down for a "permanent" fit. Figuring out the exact thickness of the rail block to keep the guard level and the stubb inserted properly took a bit of trial and error.

Here is the guard with the rail block attached and the shroud after they've been sand blasted with 80 grit garnet. I drilled some vent holes in the shroud for a couple reasons. One, this allows the porting on the barrel to actually work without causing a backpressure. Secondly, I didn't want it to be possibly construed as a pressure retention tube...ie:suppressor...by the men in black. I may have to go back and put some more in if the barrel ports don't seem to be working well enough. I was shooting it and there was substantial vapor coming out the small holes in the shroud. I'll find out tomorrow how it works.



Here's the finished marker. I parkerized the steel shroud. This required soaking in 200* manganese phosphate solution. This part was small enough I did it on the stovetop with one of my wife's stainless pots. Shhhhhhh....I'll deny everything!

I was going to use duracoat weapons coating on the aluminum, but my hardeners were trashed and I'm not going to spend $50 on piant for a paintball marker. We'll be coating a half-dozen M4 rifles later this Fall, I'll do the paint then. For now, I used BBQ black heat resistant paint. This sticks great to aluminum and matched the factory finish on the marker perfect.

I need to redo the hole where the factory screw goes through the lower section to hold the guard in place. I free-handed drilling it and got it angled off so the screw doesn't line up with the threaded hole. I know, I know....a vertical mill, a mill vice, jigs and cutters....and I free hand a critical hole with a hand drill.

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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Sun Sep 22, 2013 3:01 am

Now......what to do on my son's A5? :)
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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Sun Sep 22, 2013 3:02 am

what did all that cost u?


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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Sun Sep 22, 2013 3:21 am

I had everything on hand except the router bits and I got those for $8.

All the aluminum blocks and such I've picked up for free over the years.

The chrome-moly steel tubing was bought for some rifle projects last year and was the wrong size, so it's just been laying around. I think it runs about $6/foot these days for that size.

Aluminum round tube drop sections run a few bucks each on ebay.

Quality time sweating in the garage while being sucked dry by mosquitoes....priceless!
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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Sun Sep 22, 2013 3:38 am

dude you totally need to open a shop here offering services like aluminum foregrips, or rails made from aluminium,..


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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Sun Sep 22, 2013 10:52 pm

The weather was absolutely gorgeous today and despite 3" of rain Friday, the mud wasn't bad at all. I got to use my new set up and I absolutely loved it. The J&J was awesome. It's nice to actually hit what you're pointing at.

My mods were a big hit. All day long I had people coming up asking what I had.

"Oh, that's just an Alpha Black".....after being last man standing on my team twice and clearing the remaining opposition solo...the conversations changed to "hey, what did you make for that...what's on that again?". That was usually followed by "what could you make to fit XXX on an XXXX....?" I'm not sure I'd have the balls to start modding somebody else's $1500 gun!
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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Sat Sep 28, 2013 12:26 pm

Wow I finally caught up on this thread, the step-by-step photos are incredible! Thank you for sharing so much with us!!

Gun looks awesome! Exactly what I'm feeling like at the moment, getting some kit together for a CQB loadout. Have an almost-stock Alpha Black but the previous owner shaved off the top carry handle/sight and removed the forward sight. Considering a reduced length guard, and either a shorter barrel, or a fit-over "rain shroud" suppressor. I'll be going very slowly though, not as much play time as I was hoping for at the moment.
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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Sat Sep 28, 2013 5:57 pm

You could drill/tap/pin and mount a rail block on top of the receiver...or just use a front guard that has one that comes back over the marker receiver when the guard is in place. Maybe have it so it gets pinned in place by one of the main housing screws. If I can help, let me know.

Next up is my son's A5. Not sure what I'm going to do with that one. I might go for an AK/M85 look since I have a box of various AK stock parts.

Maybe make it look like this:
krinkov M85 parts

Or maybe keep with the HK look of the A5

http://www.bing.com/images/search?q=g3k&qpvt=g3k&FORM=IGRE&CW=1779&CH=904&USID=9A3BD7658938437B84ED38690107F7C7&RDUTC=130248759442212306#view=detail&id=2971EFAD972F6E6EBB450A276C7A92A90CA8D213&selectedIndex=52
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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Wed Oct 02, 2013 2:47 pm

Pimping out the A5....

I decided to go with the look of an HK series rifle since the A5 is supposed to mimic an MP5K anyway. That, and it's what my son wants and it's his marker!

First up will be a barrel changeout. It currently has a 6" "specops" barrel that has the dummy suppressor shroud and such. It's falling apart and doesn't shoot all that great. I want to put a .687 Lapco barrel on it.

I'll be doing one to mimic a G3K rifle so I want to put a magwell on it for looks. I have a box of G3 mags and am already doing one for an AK based project rifle, so I already have the dimensions worked out (I'll get some pics up this evening...I can't access photobucket at work).

I'll do up a front assembly that looks like the G3/HK series rifles as well. These are commercially available...but cost as much as what I paid for the whole A5 package!!! I can't spend that, so into the shop I go! I'm building a 9mm rifle based on an MP5, so again, I have the tube dimensions and fittings already worked out...it's just a matter of attaching them to a marker. (same as above, I'll get some pics up this evening)

Edited to add in pics...

The magwell is made from 0.032" 1095 steel here, but I'll probably do aluminum for the A5 and just rivet in a mag catch assembly block. I'll have to see how I can attach it to the A5. The screws are kind of hard to get to on this marker. (for the curious...this is a .243 WIN bastardized AK I'm making)




Here's the MP5 type assembly. The upper tube would fit around the upper half of the marker and be attached to the lower handguard assembly as well. There are plenty of commercial models out there to mimic/copy. The pic here is done with all 4140/30 chrome-moly tubing and sheet. This one's a 9mm, but the following pic is what I want the marker to resemble when done....a 7.62 x51 model.



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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Thu Oct 03, 2013 9:05 am

WOW!!!!  Love it!  keep those ideas and pics coming!!!
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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Thu Oct 03, 2013 11:38 am

Hmmm....now that's something I could certainly help with. If anyone wants magwells created for specific weapons to bling out a marker, I could make a base magwell with mag catch that they can finish out to whatever marker they have.

I have mags for AR, AK, FAL, HK/G3, PPS-41, PPS-43, Suomi, M1 carbine.....now if I just had injection molding equipment to make paintball mags for these as well! Unfortunately, to get that equipment, the mags would have to cost about $2000 each! Hah!
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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Fri Oct 04, 2013 12:13 am

Ordered an 8" lapco bigshot, .687" cal. Looking forward to trying it out. Got a skeleton stock as well. Couldn't find what I wanted in front guards, so I'll be making my own. Kind of funny that for an A5 (which mimics an HK-MP5k), you can find a crapload of AR style front ends as well as AK ones, but HK styled ones are non existent.
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PostSubject: Re: ready to start making chips - compact barrel suggestons?   Mon Oct 07, 2013 9:27 pm

We got the barrel and stock in today. The stock looks great. There were several reviews saying theirs was wobbly and loose. This one is tight and solid with no issues.

The barrel....wow. That was a dramatic increase in accuracy. At ~55'-60' it was shooting 5" groups or less. We dropped back to 85' and had no problems putting paint on target. I need to drop down the air pressure. The tighter fitting balls need way less air. I don't know how fast these were coming out, But I'd guess somewhere in the 315 fps range max.

The gun ran out of air and chopped one as it farted away it's last breath. I switched tanks and went to shoot again and they were flying wildly. This barrel shoots awesome...but it requires a perfectly clean barrel! My J&J can't shoot this tight, but a couple air bursts, and I can clear a barrel break and be back to normal. It'll be interesting to compare the two during play.
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