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PRI Delta FF Tubes

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/20/2011 at 21:25
Cody.e.Smith View Drop Down
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Joined: May/24/2011
Location: WI
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Here are some more pics of my rifles with the PRI delta tubes.  The tan rifle is an AR15 that I built to the Army MK12 Mod0 specs with a few minor upgrades and changes.  The black and olive rifle started its life as a DPMS LR-308 that has seen extensive mods.

I apologize for the size of the photos, I still haven't figured out how to reduce the size.


this is the balance point of the MK12 without the 2 1/2lb suppressor attached.


the balance point of the MK12 with the 2 1/2lb suppressor attached.


balance point of the LR-308


both rifles have the PRI rifle length Delta tube.  the MK12 has an 18" heavy contour Proof Research carbon fiber barrel.  The LR-308 has a Proof Research carbon fiber 20" bull barrel.


MK12 has the 1 piece full length Swan Sleeve and the LR-308 is sporting the standard PRI rails.
















rifle as pictured weighs 9lbs.






 




Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/20/2011 at 21:37
Cody.e.Smith View Drop Down
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Joined: May/24/2011
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moving the specs that I have on these tubes over here as well.


Here are the weights from the round FF tubes and the Delta tubes per length from PRI's catalog.

round tube with rails.
7" 11oz
9" 14oz
12.5" 16.5oz
catalog does not give weight for the 14.5" or 15.5" length with rails.

round target forearm without rails ( not sure of length but I believe at least 14") 10oz

Delta tube with rails
9" 13oz
12.5"  15oz

.308 round tubes with rails
9.5"  16oz
12.75"  18oz
14"  18oz ( not sure how it weights the same as 12.75")

target forearm no holes or rails
14/15"  13oz

They are making the Delta tubes for the .308 platforms and I will post some pics this evening of mine but I can not find the weights on them but I think they are about 1oz lighter than the round tubes.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2011 at 10:48
SVT_Tactical View Drop Down
Optics Retard
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Chief Sackscratch

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Whats the deal with the side charger, make? Details!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2011 at 21:52
Cody.e.Smith View Drop Down
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Joined: May/24/2011
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I sent the bolt carrier for the 308 to a local machine shop to have it drilled and tapped.  The bolt carrier in the MK12 is from Young Manufacturing and I ordered it already drilled and tapped.  The handle on the 308 is from Young Manufacturing and the handle on the MK12 is an old style handle from Medisha Arms.

I had to switch the handle on the two rifles because the one that came with the bolt carrier from YM wasn't long enough to clear the BAD lever on the MK12.  As for the machining of the receivers, I did that myself.

My personal preference between right or left side charging handle is definitely have it on the right side for precision shooting from prone while having some sort of extended latch on the standard charging handle.  I use my support hand to support the butt stock and make adjustments to aim and use my firing hand to manipulate the action, this way I can maintain sight picture.  This works well with auto rifles since I shoot bolt rifles the same way.

Left side charging handles are great for a typical battle rifle or for CQB and greatly reduces the amount of time to clear malfunctions and being attached to the bolt carrier lends itself in a more ergonomic location versus a battle latch on the standard charging handle.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/23/2011 at 13:16
cheaptrick View Drop Down
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Nice blasters! 

No dust covers?!?!? What in the wide world of sports is that all about?!?!?  Shocked Wink
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/23/2011 at 19:03
Cody.e.Smith View Drop Down
Optics Apprentice
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Joined: May/24/2011
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Thanks, I do like them and they have served me well.  

No I don't have any dust covers on my AR's except for my AR pistol.  That is the only one that does not have a side charging handle on it.  Yes they are nice when closed to keep junk out but it is very rare that mine were ever not being used thus the dust cover was always open regardless.

All of my rifles have a special coating on the inside of the receiver and on the BCG that greatly reduces the need of lubrication and does not allow carbon to stick to it.  Dust and sand have a hard time sticking to it as well.  The coating I have done by Micro Surface Corp.  http://www.microsurfacecorp.com/

They take my BCG and upper and determine the make up of the materials and either do a hard chrome lining or a nickle ceramic lining on both than finish with a coat of WS2 (tungston di sulfide).
This is the slickest dry film that is currently in existence.  There is no true run dry coating out there.  They are all designed to run with minimal amounts of wet lube to run at optimum capacity.  I use 1 drop of synthetic oil with a very low gelling temp on the bearing surfaces of the BCG and rub it around and that lasts for about 4-6 thousand rounds.

For the most part at that time I will take a clean rag and put on some CLP or a Butches bore cleaner on the rag and just wipe the inside of the upper and the BCG off than run over it with a clean dry rag.  That is generally all it takes to clean the parts that have been coated with this process to clean it.  I have my trigger groups all coated with the WS2 as well.  

Taking a standard trigger and coating all parts with the WS2 will drop the trigger pull by about 1 1/2lbs and will make it smooth.  If you have a worked over trigger or match trigger, it is night and day between a before and after comparison.  I use JP adjustable triggers that I hone and work over to get a very nice 3lb pull with 3mm travel before they break.  After coating with the WS2 it is still at 3lbs pull but slick  as can be.  It makes a standard JP trigger feel like a standard AR trigger by comparison.

They don't advertise gun coatings on their web page but they are the company that does the coatings for the majority of the gun manufacturers out there.
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