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Scratch building an SPR

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Old June 22nd, 2010, 23:32   #1
naminator
 
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Scratch building an SPR

So I want to Scratch build an M4 SPR.

I have no base gun. Price is really not an option. I would prefer complete mec boxes, but parts are fine too. The reason I do not have a base is because I will most likely custom order a G&P Metal Receiver that I like.

So Tips, Comments, Starting points. I kinda need a spoon here people.

To start with is the Mech Box. Should I buy a complete G&P Mech Box? Or should I buy some better shell and but a bunch of excellent parts into it. Once again Price is not an issue. Money is not really a concern for this build.

EDIT: I kinda like the look of this Gun:

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1+1 = 2
Were you maybe expecting 1+1 = donut?

Last edited by naminator; June 22nd, 2010 at 23:34..
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Old June 22nd, 2010, 23:47   #2
Styrak
 
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Were you looking to make just a custom M4 perhaps?
Generally SPR's look something more like this:


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Old June 22nd, 2010, 23:51   #3
The Chad
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I agree with Styrak, mostly, the mag SHOULD be a VN mag. It's hard to get settled with a 30RD one.
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If you were trying to insert a magazine into another magazine then I guess that would be indeed ghey. Inserting a magazine in a magwell seems rather hetero to me. The tape is merely metro, calling it ghey is rather absurd and makes it hard for the metro magazines to socialize with other magazines.
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Old June 23rd, 2010, 00:08   #4
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I was looking at something closer to the second one Styrak. The only reason I posted my pic was because I want something similar. VN Mags are no problem.

Last year I bought a M16A2 in the hopes of turnings it into an SPR but that failed. Now I think I can swing building one.

I was considering a SR-25, but I heard that the 7.62mm style mags and Receiver are harder to find. I also read they take a special mech box, like a V2 but longer. So I am looking at a SPR/DMR based off of a 5.56mm platform.
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1+1 = 2
Were you maybe expecting 1+1 = donut?
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Old June 23rd, 2010, 00:08   #5
disasterarea
 
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I know externals fairly well, so I'll give some of what I see in the pic.
-Magpul MOE grip
-Magpul UBR stock
-Magpul AFG
-Magpul PMAG 30rd
-Harris bipod
-Folding BUIS system
-Leupold scope
-A2 flash hider
-basic RIS system
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Old June 23rd, 2010, 00:24   #6
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You should really source an ICS M4 full metal. The trades might not be perfect from the start, but for a mid to high power rifle, it beats down any other M4 build. More solid, more reliable, easier to work when it breaks.

The newer ones accept most regular M4 parts. You need to slightly mod the buffer tube holder if you want to use an exotic stock. If you want a crane, LE or full stock, ICS makes them and you can find a rifle that will have that already stock.
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Old June 23rd, 2010, 00:26   #7
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Ok I think I figured it out.

I want to scratch build a MK12 Mod 1 SPR.

I will buy the the Receiver in Canada when I get to that point. All the accessories on the gun will come later. Right now I want to know about the Front assembly and internals.

Basically the MK12 Mod 1 Upper and RAS, and how to build the best Mechbox ever (400FPS Limit, not goal) and how to get as much accuracy out of the gun.

Not a fan of ICS. Most of the local run G&P/TM with some clones mixed in for good measure. Not crazy on the idea of a split mechbox unless ICS makes something different.

Besides I want to build from the ground up. Don't really want to buy a complete gun and then modify it. I want full control over this build.
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1+1 = 2
Were you maybe expecting 1+1 = donut?
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Old June 23rd, 2010, 00:30   #8
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If money isn't a problem then why not build it off of a PTW with an unmarked receiver.

Or better yet from many perspectives why not a GBBR?
Their instant trigger response and increased efficiency with heavy ammo would make for a great DMR platform.

The plus with both routes is the ability to swap uppers and change velocity very easily.

-Grant
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Old June 23rd, 2010, 00:35   #9
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I am concerned about the reliability of Gas Guns. A local had one and it gave him numerous problems that where never remedied. It may be something I consider down the line. A gas gun is definitely possible, but I don't think they make VN mags for them quite yet.

And with the PTW I don't think there are VN Mags either. Nothing against PTW but I am also worried about how sensitive the electronics are and how I would get the gun fixed in the case of damage.

Let me clarify my "No price limit" I was looking to keep it around the 2000$ mark or less. If it is more no problem, but spending 2000$ on a base gun that I basically want to tear apart is not in my best interests.
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1+1 = 2
Were you maybe expecting 1+1 = donut?
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Old June 23rd, 2010, 00:43   #10
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Just a little curious for GBBR's as a DMR: wouldn't the fluctuating gas pressures (whether day to day or even shot to shot) lead to inconsistent shots that are necessary for a good dmr?

I was thinking it would be awesome to make a GBBR DMR but thats the big issue in my mind
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Old June 23rd, 2010, 00:44   #11
The Chad
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Get an M-14 EBR done!
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Originally Posted by BennyBoy View Post
If you were trying to insert a magazine into another magazine then I guess that would be indeed ghey. Inserting a magazine in a magwell seems rather hetero to me. The tape is merely metro, calling it ghey is rather absurd and makes it hard for the metro magazines to socialize with other magazines.
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Old June 23rd, 2010, 00:46   #12
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Quote:
Originally Posted by The Chad View Post
Get an M-14 EBR done!
No.



But seriously.

AEG

MK12 MOD1 SPR or some other armalite based 5.56mm SPR
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1+1 = 2
Were you maybe expecting 1+1 = donut?
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Old June 23rd, 2010, 00:56   #13
The Chad
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sprmodo.JPG

Just the B model.
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Originally Posted by BennyBoy View Post
If you were trying to insert a magazine into another magazine then I guess that would be indeed ghey. Inserting a magazine in a magwell seems rather hetero to me. The tape is merely metro, calling it ghey is rather absurd and makes it hard for the metro magazines to socialize with other magazines.
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Old June 23rd, 2010, 01:24   #14
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I remember looking into this a year ago but it never really got off the ground.

Basically the parts list I had included a G&P metal receiver and a SystemA complete Mechabox. At the time I was weighting the options of a "Revolution" vs the "Complete Mechabox" (both M120 springs).

However there's also the SystemA "ENERGY" mechboxes now which I don't understand anything about but supposedly they're better than the standard "complete" mechboxes for a little bit more.

So after this you're probably out around $550, so the rest can be spent on externals. I believe G&P offers a front end set for the SPR (maybe including stock however I'm not 100% sure as this is only what I remember).

Good luck.
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Old June 23rd, 2010, 01:46   #15
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Heheheh

Why don't you like the ICS slit mechbox?

It is at least 20 times more sturdy than any other mechbox avalaible. It is harder to break an ICS mechbox shell with a spring too hot than to break a V3 AK shell or P90 shell...

If you are concerned about the alignment, have you even took one apart and matched the gun outside of a body? I did. You CANNOT unlock the shell when the rear pin is in. I put mine in a vise and forced on it with a 2x4 to try and prove to a guy that it does not move.

Gear mesh? Why would it be different than any other gun? The mechbox halves are not moving.

Incompatible internals? That is pure bullshit. The ONLY incomatible part is the anti-reversal latch, but people break that everyday it seems...

Hop-up chamber is incredibly more consistent and stable and any V2 hop-up ever.

I built a gun from a cracked receiver I got cheap and it is still going strong.

Funny thing, I installed parts on it that where "impossible to fit without a LOT of issues"... took me about 3 hours to go from a bag of parts to a fully functional rifle.

Here:



That is a Magpull MOE, China-made crane stock with a large 9.6v battery in there, Madbull Noveske 10" RIS, ICS stock barrel (I had a Madbull 10.5" but prefered the 14.5" look), MBUI set.

The internals where a set of Modify gears, Modify 6mm bushings, ICS nozzle, ICS tappet plate, Action trigger assembly, ICS ARL, TM piston, China bearing spring guide, Modify cylinder head, ICS piston head ported, Modify M110 spring, Guarder clear rubber, Prometheus 6.03 tighbore, M4 lenght.
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Damnit, don't make me add "no discussing temporal paradoxes" to the rules or I'll go back in time and ban you last week.

Last edited by Kos-Mos; June 23rd, 2010 at 01:50..
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