Precision AR15 build, possibly 3 gun

[Mr Boomer]

I have all the parts ordered and on hand, except for scope mount and optics.


Lower:
Spikes Tactical lower. Spider with bullet pictograms
Geissele SSA-E trigger
Ergo F93 pro stock
JP tuned and polished extra power carbine buffer spring
Spikes Tactical T2 buffer
JP lower parts kit, minus trigger group
Ergo grip w/ palm shelf


Upper:
Spikes Tactical upper
BCM 20in SAM-R 410 stainless steel heavy barrel, 1:8 twist
*BCM low profile gas block*. This has been changed to a JP adjustable low profile gas block
BCM rifle length gas tube
BCM 1.5 Compensator
Midwest Industries 15 in gen2 SS Series
Midwest Industries hand grip panels
Spikes Tactical BCG
Spikes Tactical Charging handle
*Magpul MBUS front and rear *. Thinking of changing this to a 45 degree offset irons
Leupold VX-R Patrol 3-9 Firedot


Other:
Magpul MS3 sling
Harris 9-13 in pivot bipod
Magpul 20 round - 2ea

Thoughts on build?? Everything has been purchased and awaiting assembly, except potential offset iron sights

 

[42769vette]

That is not the best option in optics for a 3 gun rifle. If you havent ordered the scope and mount Id order something else.

If you go with a 1-4 you can skip the offset irons, and kill 2 birds with 1 stone.

 

[Mr Boomer]

I realized a little late that this is not the best magnification option for 3 gun primary use. But this is also being built so I can practice longer distance shooting (100-400 yds) for cheaper than my match grade .308 ammo. I figured I could leave it at 3X and then alternate to iron offsets for the time being, till I can afford another scope with a true 1X power. I got a great deal on the Leupold VX-R though. 350 bucks off including mount.

 

[Mr Boomer]

Other changes I am contemplating is getting an extended tactical bolt release. I know Magpul makes a decent one. Maybe a custom ejection cover to personalize it.

 

[cjfarmer]

I believe you will find that the 20 inch will be a tad long on some stages in 3 gun. It looks like its pretty heavy as well, you may get tired of lugging that thing around.

 

[Mr Boomer]

Yup it will prolly be round 8 lbs. I will have to weigh it. The sucky part of building one for a dual purpose.

 

[mertbl]

Get a good mount that'll return to zero every time and just shoot irons for 3 gun.

 

[sig1473]

Yup it will prolly be round 8 lbs. I will have to weigh it. The sucky part of building one for a dual purpose.

I'm gonna say it will be more than 8lbs w/optic and loaded mag.

 

[Mr Boomer]

Will have to weight and see. We could start an over and under contest, lol. I contact Leupold to switch my order to the VX-R Patrol 1.25-4X20mm. Winning, thanks for the insight ingo

 

[pierce195]

Looks like a quality build.

 

[Mr Boomer]

Got a question fellows. Should I mount my Magpul MBUS normally, put them on 45 degree offset mounts, or get 45 degree offset sights such as KACs? Let me know what you think

 

[JollyMon]

Looks like you have thought your next build through. I do think you will be more happy with the scope to the 1.25-5 instead 3-9.

 

[42769vette]

If it were me, and I had a 1.25-4 I wouldnt mount the MBUS's at all with the intentions of useing them in 3 gun. If I did mount them it would be for optic failure, and I would put the scope in a quality QD mount, and pop it off if it breaks.

 

[jonny4523]

Good work going with a nice trigger from the beginning.

I agree, a 20 inch heavy barrel might prove tiresome. As far as the optic / sights, I just use an Aimpoint (1x), no irons. I take it out to 300 yards and it's served me well. I assume the bipod will be for non-3gun shooting?

If I were you, I'd just start a second build!

 

[Mr Boomer]

yup the bipod will prolly only be put on with bench shooting or when i am in the field. Think my wife will want me to wait a while for another build. This one has been kinda pricey.

 

[jonny4523]

Ah, it's only money, right?!?! haha.

yup the bipod will prolly only be put on with bench shooting or when i am in the field. Think my wife will want me to wait a while for another build. This one has been kinda pricey.

 

[cjfarmer]

You can use the bi-pod for 3-gun, but moves you into open class. You could put a red dot on a 45* mount if you run open.

 

[Mr Boomer]

Jonny-I guess I can always make more tomorrow. But my buddy says, "dont press your luck."

cjfarmer- i am interested in the tactical optic division. But I am going to keep an open mind till I observe/participate in some matches.

 

[junglerogue]

Zmadren,
i just put together a similar build. Bought a PRI 3-gun 18" upper in FDE with their proprietary muzzle brake. PEPR scope mount, with a Vortex PST 1-4X24. Geissele 3 gun trigger. Magpul UBR with a Spikes ST2.
Here's the upper next to my CMMG 22 16" upper.


Then the finished rifle at the range.


Vortex Reticle


Then I was working on load developments, 77grn Nosler BTHP, 69grn Winchester match, and 45grn Winchester JHP. Pretty sure I'll go with 65-69grn projectiles. All shot at 50yards, with 5 shot groups.

77grn


69grn


45grn


Hope it's helpful!