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View Full Version : KR7 Build - my first .308 semi


nimoZ
09-07-2010, 4:32 PM
I have been looking at getting a .308 semi ever since I realized that my PSL was more fun to shoot than my AR15.

As I enjoy reading about your builds, I thought I share. Need to figure out how to snap better photos though...

Parts:
- Kaiser KR7 upper/lower receiver pair
- JP 18" barrel w brake, heat sink and adjustable mid length gas system
- JP LMOS carrier and bolt
- JP Hand guard
- IOR 2.5-10x42 scope
- Harris bipod
- BCM Charge handle
- DPMS LR308 buffer and rifle spring
- Armalite AR10 buffer tube
- Armalite AR10 FA
- RR lower parts w 2 stage trigger (uses AR15 parts, except 2 pins that Kaiser included.)
- Magpul PRS stock

Was a little worried about size and weight, but it turned out OK : 6kg even with scope and ca 40" long - this rifle is just slightly heavier and about the same length as my 20" AR15 w DD-12" rail, PRS stock and same scope (5.6kg)

BUT .308 is really a lot more expensive too shoot than 5.56, 7.62x39 and 7.62x54R :eek:
- And nice ammo shoots better than cheap, so reloading is imminent :)

For anyone looking for a .308 that shoots soft like an AR15, this is not it - but it's also why I like it - mission accomplished :D

(Don't tell my wife that her curtain was used for the photo)
http://lh4.ggpht.com/_4g6AyfVltww/TIa-n4O2H4I/AAAAAAAAH1k/-p6aGTSBsjs/s800/DSC01907d.jpg

Rogu3
09-07-2010, 4:33 PM
Very nice, very, very nice.

Jpach
09-07-2010, 4:53 PM
Very cool. Hows it group?

nimoZ
09-07-2010, 5:29 PM
Very nice, very, very nice.

Thanks!

Very cool. Hows it group?

So far it has grouped very differently depending on ammo, but I'm still getting used to it.
- American Eagle 150gr FMJ BT: Like the scope is loose - Did I just do that?
Couldn't even get it zeroed properly. (8 series of 5)
- Winchester 150gr powerpoint was much better (1 series of 8 and 1 series 10 below)
- Federal 168gr match king BTHP - best - half the spread of Winchester or less.
As I was just trying to get it zeroed, I was at 50y. ca 1" for 10shots with 1 "flyer" using Federal in the first attempt. Didn't have time to repeat as I wasted too much time with the AE crap.

Not sure why the big difference in ammo, but it could also be me getting used to rifle. as I shot them in the order I listed.

In the picture below:
1. 10 shots at #2 with Winchester
2. Miss adjusted and verified at #3.
3. re-adjusted and shot remaining 8 at #4.
4. re-adjusted and shot Federal 10 shots at the top.
Did not have the rear pod on and no bag, so the hight variation is all me.

http://lh6.ggpht.com/_4g6AyfVltww/TIbVvD2niRI/AAAAAAAAH18/eJpm__QlhEg/s800/photo-5.JPG

DeltaBronco
09-07-2010, 5:31 PM
Sweet rig.

tomd1584
09-07-2010, 5:31 PM
thats a great looking rifle!

bomb_on_bus
09-07-2010, 5:45 PM
Great looking setup! How are you liking AD recon?

ZX-10R
09-07-2010, 5:49 PM
Beautiful...That American Defense recon mount?

aslowdodge
09-07-2010, 5:55 PM
sweeeet!

nimoZ
09-07-2010, 6:18 PM
Beautiful...That American Defense recon mount?

Yes!

Great looking setup! How are you liking AD recon?

Very much.
- Great fit, No play in rail - doesn't move in the rail at all, even before locking it.
- Easy to adjust
- Light force to move levers
- Nice lock mechanism for lever.

And scope sits firmly and at the right hight for me :)

Have not really checked zero after moving it, as I tend to leave it on the rifle during cleaning.

Got it with the scope from Liberty Optics about a year ago - no issues.

Rogu3
09-07-2010, 6:22 PM
Where'd you get that monopod?

nimoZ
09-07-2010, 6:33 PM
Where'd you get that monopod?
Accu-shot dot com
- Think it's available from multiple sources.

Jpach
09-07-2010, 9:56 PM
Very nice groups. What more could you ask for?

nimoZ
09-08-2010, 12:46 AM
Very nice groups. What more could you ask for?

Thank you.
- If I got one wish, it would be that match ammo was cheaper - lol.

This was only at 50y and the American Eagle picture wasn't pretty at all.
I will try them again at 100y as I have some left, else my hobby just got more expensive - again :)

Lead-Thrower
09-08-2010, 9:16 AM
Thank you.
- If I got one wish, it would be that match ammo was cheaper - lol.

Time to start reloading. I would also recommend trying some 175 grain bullets. Since you dont reload yet, I recommend trying some Black Hills 175gr. ammo.

UnitedWeStand
09-08-2010, 9:27 AM
Looks very nice...... :drool5:

Legasat
09-08-2010, 9:40 AM
Great looking rifle. Very nice shooting! Congrats!

nimoZ
09-08-2010, 10:49 AM
Time to start reloading. I would also recommend trying some 175 grain bullets. Since you dont reload yet, I recommend trying some Black Hills 175gr. ammo.

Thanks, will look for Black Hills. They get good reviews.

I got my reloading kit mostly sorted from reading the "Match Ammo is too expensive" thread by AR15Barrels, but still need to figure out what I want to copy and also what neck sizing bushings I need.
- My goal would either be to just reload optimized for my bolt gun and use the same for this, or find a cheaper bullet for the AR.
The AR beats up the brass more, so I may end up keeping separate stashes anyway.

killshot44
09-08-2010, 11:26 AM
nimoZ,
You're on the right path (handloading), you should be able to use your ammo in both guns unless the chambers are vastly different. I used Randall's list as well and the Redding dies are fantastic.

Also, putting some adhesive-backed rubber/foam on top of the deflector will minimize the dents in the brass from the AR.

nimoZ
09-08-2010, 11:34 AM
nimoZ,
You're on the right path (handloading), you should be able to use your ammo in both guns unless the chambers are vastly different. I used Randall's list as well and the Redding dies are fantastic.

Also, putting some adhesive-backed rubber/foam on top of the deflector will minimize the dents in the brass from the AR.

Thanks - Will try that!

Rogu3
09-09-2010, 10:41 AM
Go with Berger VLDs if you don't mind 13 cents more per round. If you want to shoot past 400 that is...

killshot44
09-09-2010, 5:31 PM
Go with Berger VLDs if you don't mind 13 cents more per round. If you want to shoot past 400 that is...

A big +1 for Berger's bullets. Stopped buying Sierras completely...

Rogu3
09-09-2010, 6:46 PM
A big +1 for Berger's bullets. Stopped buying Sierras completely...

Sick, i love the 168s in my 7x57AI, now if they'd just make 250 gr. 338....

nimoZ
09-18-2010, 11:58 PM
Time to start reloading. I would also recommend trying some 175 grain bullets. Since you dont reload yet, I recommend trying some Black Hills 175gr. ammo.

Tried Black Hills 175gr - best I used so far!

- 6 shots at 100y (Pic 1.) - I think, as I only had 4 holes in the next target. Anyway, it's nice when you only need one sticker to cover the holes :)
I tried to compare it with Federal GMM 175gr and groupings were always better with BH, but that could be me.

As a blind test, I had two friends try regular Winchester 147gr FMJ for two 10 sets - shooting this rifle for the 1st time, and then BH 175gr. Cut their spread by 75% - but so did Federal GMM 175gr. (Pic 3.)
- Could also be getting used to the rifle, but booth got the same improvement.
Target 2, person 1, BH 175gr
Target 3, person 2, BH 175gr
Traget 4, person 1, Federal 175gr
- The extra holes on respective target are by the same shooter using W 147gr.

Also broke my bolt catch spring, but that doesn't seem to have any impact on usability.
- KR7 uses AR15 LPK, not sure if that matters and I should look for another type spring. Will know if it brakes again.

http://lh4.ggpht.com/_4g6AyfVltww/TJWn7KPmGqI/AAAAAAAAH2c/0cwKbmZku0g/s800/IMG_0404_2.jpg

http://lh6.ggpht.com/_4g6AyfVltww/TJWn6oKWSzI/AAAAAAAAH2U/wBigw-BPFq4/s800/IMG_0405.jpg

http://lh6.ggpht.com/_4g6AyfVltww/TJWspM-czkI/AAAAAAAAH24/DHRlDqYXO0E/s800/IMG_0406.jpg

RT13
09-19-2010, 1:19 AM
Very nice! I would love to add a KR7 for my KR5's.:)