ProgSpear Build thread - AR15 tack driver.

[Meketrefe]

I am opening this for Prog so folks can answer questions, propose parts, ideas and post links for Prog's build.

The first step is to read this thread that provides some general direction and ideas....
http://www.nyshenaniguns.com/forum/h...accuracy-tango

[ProgSpear]

Thanks Meke. I'm starting a little different project for myself. Starting with a compliant 16" carbine that I got from DarthVader (Ranger1033 on the "old" site) I've yet to go seriously play with it, as the last year of my life has been utterly consumed with putting an addition on my house. That's kind of winding down, so I'm starting to think about having some fun again. I want to take the same lower and build 3 distinct tops for it. I'll keep the 16" 5.56 top for HD, with a dot. light, and green laser on it. I have a 5.56 20" HBAR barrel that I want to turn into a varmint killer, and finally I just got an18" .264LBC/6.5G barrel from Meke that will be for bigger varmints. Now I have to get a few additional optics, gas blocks, tubes, uppers, handgards, BCG's, etc. Oh, and an ambi safety. My wife will hate me.

edit: ...and reloading dies for the .264

[GUNSICK]

Best ambi safety for the money. I have 3 and like it better than any other I have tried. Better then Battle Arms Development which I also have purchasd before I found these and half the price. You won't be disappointed! Comes with a stainless detent and spring also.

http://www.defensepackage.com/?data=...sp&sku=1002000

[Meketrefe]

I like that Ambi gunsick posted. I always use the same two models not even sure who makes them.
I like these YH pins that work great with my sausage size fingers...
http://www.surplusammo.com/yankee-hi...-set-yhm-7284/




This is the trigger I told you that can be tuned to 2lbs if you want even with the standard spring.
These are the same sold by fulton and folks compete with them.
http://www.surplusammo.com/rock-rive...kit-for-ar-15/
With the entire LPK is a great price for this trigger...
http://www.surplusammo.com/rock-rive...ger-for-ar-15/





This group seems like a great deal nitride treated. Save the actual bolt and use the carrier for the LBC.
Otherwise young manufacturing is the budget version of their national match but in phosphate vs chrome...
http://www.surplusammo.com/young-mfg...auto-complete/

Whatever you get make sure it has stacked key and a shrouded bottom with a smooth rounded and well finished edges.

[Meketrefe]

Same alloy and cut as this one but different finish...

http://www.rainierarms.com/young-mfg...ier-group-6918

These are super easy to clean.

[DarthVader]

Thanks Meke. I'm starting a little different project for myself. Starting with a compliant 16" carbine that I got from DarthVader (Ranger1033 on the "old" site) I've yet to go seriously play with it, as the last year of my life has been utterly consumed with putting an addition on my house. That's kind of winding down, so I'm starting to think about having some fun again. I want to take the same lower and build 3 distinct tops for it. I'll keep the 16" 5.56 top for HD, with a dot. light, and green laser on it. I have a 5.56 20" HBAR barrel that I want to turn into a varmint killer, and finally I just got an18" .264LBC/6.5G barrel from Meke that will be for bigger varmints. Now I have to get a few additional optics, gas blocks, tubes, uppers, handgards, BCG's, etc. Oh, and an ambi safety. My wife will hate me.

edit: ...and reloading dies for the .264

Hello ProgSpear,

Glad to see you made it NYSG,It has been awhile since I last talked to you,I hope all is going well and your getting your remodeling all caught up..I had a great time when I went out t your place,I do miss the rifle I sold you like so many of my other guns..

I wish I could help you out but this is out of my league so I say this to you good luck with your new build..

Clarence

[ProgSpear]

Heres the goal. probably not attainable with the 18" barrel, so it may neccessitate a longer one some day. once my wife gets over the sticker shock on this build. LOL.
(still scrounging parts, so no pix for a while)

1000 yard milk jug challenge
https://www.youtube.com/watch?v=M_9us2y4B9g

[Meketrefe]

Good to know there is a cartrige capable of killing milk jugs at 1000 yards! lol.
Of course it is doable with your 18" barrel and specially with the hot weather coming...
11 mils is a very similar trajectory to a 308w 175gr sniper round. Just a bit less energy and momentum on the target
but plenty to kill paper and jugs ...or a coyote or chuck if you can hit them!

Ballistics Results - 6.5G 123gr AMAX

RANGE(YARDS)	VELOCITY(FPS)	ENERGY(FT.-LB.)	TRAJECTORY(IN)	COME UP IN MOA	COME UP IN MILS	WIND DRIFT(IN)	WIND DRIFT IN MOA	WIND DRIFT IN MILS
Muzzle	2500	1707	-2.5	0	0	0	0	0
100	2342	1498	1.9	-1.8	-0.5	0.7	0.7	0.2
200	2190	1309	0	0	0	2.9	1.4	0.4
300	2043	1140	-9.2	2.9	0.9	6.8	2.2	0.6
400	1902	988	-26.7	6.4	1.9	12.5	3	0.9
500	1768	854	-53.9	10.3	3	20.1	3.8	1.1
600	1641	736	-92.2	14.7	4.3	30	4.8	1.4
700	1522	633	-143.5	19.6	5.7	42.3	5.8	1.7
800	1412	545	-209.7	25	7.3	57.2	6.8	2
900	1312	470	-293.4	31.1	9.1	74.9	7.9	2.3
1000	1224	409	-397.4	37.9	11	95.5	9.1	2.7
1100	1149	361	-524.7	45.5	13.2	119	10.3	3

Your Input Variables

Ballistic Coefficient	0.51	Velocity (ft/s)	2500	Weight (grains)	123
Maximum Range (yds)	1100	Interval (yds)	100	Drag Function	G1
Sight Height (inches)	2.5	Shooting Angle (degrees)	0	Zero Range (yds)	200
Wind Speed (mph)	10	Wind Angle (degrees)	90	Altitude (ft)	555
Pressure (hg)	29.53	Temperature (F)	75	Humidity (%)	0.75

[ProgSpear]

meke, which ballistics program are you using? commercial, or something you wrote?

[Meketrefe]

I have my own but for something quick you can use any of the dozens available online like this one...
http://www.hornady.com/ballistics-re...ics-calculator

you should be able to hit the 2500fps with some commercial and definitively reloads. When you have the spreads I can run
a couple of tables with my software. in my software I have the capability to adjust variables and introduce corrections based
on the actual from field data.
Though hornady's amax and lapua scenar are pretty accurate between their published data and actual field performance.

I also want to try these.. It might be a bit too much even for the 6.5BR but we will see.
Don't buy them. If I can find them I can send you a hand full to test. Anyway this is soemthing to test later on...

Berger

130 gr Match VLD Target

.264

130

0.552

0.282

8

26403

Nosler
G1 BALLISTIC COEFFICIENT 0.561
G7 BALLISTIC COEFFICIENT 0.285






6.5mm 129 Grain
AccuBond Long Range Bullet
Part# 58943
Spitzer Point

[ProgSpear]

I can't find my Nosler book, but Hornady only lists up to 123 for 6.5G. If you're using "overweight" loads, aren't you treading into dangerous territory, or do you extrapolate to find a safe load?

[Meketrefe]

I can't find my Nosler book, but Hornady only lists up to 123 for 6.5G. If you're using "overweight" loads, aren't you treading into dangerous territory, or do you extrapolate to find a safe load?

Data can be derived and extrapolated and always starting low and working up. Books are often obsolete, specially the expensive lyman that has many mistakes. Instead go to the online data from both powder and bullet manufacturers and also the specialized forums.

Always cross check the data for safety reasons and start way lower than advertised.

Leverevolution seems like a good burning rate for this. Also CFE shoudl work fine.
http://www.reloadersnest.com/unverif...ID=365&ID=9260

http://www.reloadersnest.com/unverif...ID=365&ID=9260

Also take a look the the 65G forums that is a well organized specialized forum....

http://www.65grendel.com/forum/

here accubond devleopment....
http://www.65grendel.com/forum/showt...ght=130gr+load

What powders might work with what bullet based on burning rates....
http://grendeldata.com/pages/load-matrix

More to read. We will have to check the bullets for rate of twist...

http://www.6mmbr.com/65grendel.html

http://www.impactguns.com/alexander-...g130scbox.aspx

[ProgSpear]

jeez meke, it's like being in school again. I ask a simple question, and you assign me homework.... LOL

[Meketrefe]

jeez meke, it's like being in school again. I ask a simple question, and you assign me homework.... LOL

Yes but I gave you the cheat papers! LOL

The lever revolution is a good one but if you have varget or cfe you can try those. The CFE is high density (like lever) so it will work well with the stolen case capacity of the longer bullet.

otherwise order from these guys via your lgs...

https://secure.wf-api.com/www.precis...ong-range.html

[ProgSpear]

Rats! First hitch in the process. Picked up what should have been a "standard" M4 style flat top upper, and discovered it would not fit the Mag Tactical lower I have for this build. Apparently the pins in this lower are slightly off. I have 3 uppers, one that came with the MT lower, a Black Rain which had a Square marking = Brass Aluminum Forging Enterprises. The other two uppers have Keyhole marking = Cerro Forge.

Neither of the Keyhole uppers fit the MT lower, but all three uppers fit a BFI lower, with no problem, Note that I can drop either the front or the back pin in all three uppers with the MT, but then cannot seat the other pin for the Keyhole uppers, so I conclude there is a slight horizontal drilling error for the pins in the MT lower relative to the BFI lower. I don't have a caliper big enough to measure pin to pin, and get an accurate difference.

Any ideas on how to correct this? I do NOT want to screw up (ream) three usable uppers to correct an out of spec lower. Do I need to scoot to harbor fright (ha) and get a bigger caliper? Then what? is it possible to elongate (horizontally) the rear pin hole in the lower so it has additional clearance? Chain saw file?