research for build

[cst]

I have the mega mkm.....had a loose fit on the barrel extension of lilja. Had to use loktite. I bought a CMT upper for my wife's lilja..really tight.....milling job is perfect on that upper. Dont even have to adjust the feed ramps like thr mega.

[olde sarge]

LRRPF52, It took me a while to find the article about the update to the reloading manual and I found I had misunderstood and that they were talking about volume II calling it an update. Thanks for getting me straight on that. I am on the fence about my barrel choice now. For a rifle to hunt hogs and deer with and also punching paper would I be better served with the Lilja740 with untreated extension or a Bartlein730 with the treated extension? Will be using a PF Phalanx treated bolt and carrier. Probably will not live long enough to put more than a thousand or so rounds through it. The difference in price would almost buy me a good trigger.

[PrecisionFirearms]

Hmm I would really like to offer my opinion, but it would be rather biased!

[Adam Lilja]

Hmm I would really like to offer my opinion, but it would be rather biased!

Me too

[explorecaves]

There is something to be said for a nice trigger....

[KentuckyBuddha]

What kind of life expectancy can you get from an untreated barrel extension with a NiB bolt? Plus, does anyone have coated MF matching NiB coated barrel extensions anyway?

[PrecisionFirearms]

All our barrels within the last 2-3 months have Phalanx (melonite) treated Barrel extensions as standard. Using a phalanx treated extension along with Phalanx bolt would be a system that lasts longer than the barrel. Comes with our lifetime warranty on breakage. We even warranted the Les Baer bolts we used to use and had a lot of problems with them breaking (which we ate).

[KentuckyBuddha]

Wouldn't the melonite be much softer than NiB? Do you sell barrel extensions by themselves?

[PrecisionFirearms]

The advantage of Phalanx is that it is not a plating. No chance of it peeling or flaking. Hardness is about the same. Lubricity slightly higher on the NiB. 6 one way; Half dozen the other.

Yes we sell extensions. Price $40 with Phalanx.

[Klem]

Weighing a Mega Standard billet upper against a standard Olympic Arms upper (both unpopulated) the Mega weighs 250gms vs. the OA 200gms.

Mega's 'Standard' design is not exactly standard. It has different contours with more thickness, especially on the non-ejection side. That, and the 7075 T6 aluminum has to translate into stiffness, and that will help accuracy.

[olde sarge]

Lilja AR740 is 2lb 7oz according to drawing. What is the weight of a PF Bartlein AR720? How much weight will fluting remove from the AR720 barrel?

[olde sarge]

Finally found mention on another thread that the AR720 weighs 2lb and 10oz. Hope that is correct. Am really tending twards the Diamondhead VRS-T forearm but see that it has aligning tabs and don't know if I would have to grind them off to use with a billet receiver. If that was the case how much accuracy would I lose with a forged upper? John

[olde sarge]

Well, to all that gave me encouragement and technical advise I pulled the trigger and ordered a PF Bartlein AR720 (the phalanx treated barrel extension made the difference for me), Phalanx PF bolt carrier assembley, PF lower parts kit minus trigger, rifle length gas tube, PF low profile gas block, build box and Vol I and II of Grendel load books. Still mulling the upper and lower and have to decide between PF and AERO Precision M4E1 Enhansed Keymod. Kind of tending twards the Aero upper but not finding much about builds and barrel fit to receiver info. Want tight. Will hold off on the stock until I get the other parts assembled so I can determine how much weight I need to balance the rifle to my liking. Would like any info on AERO upper/ barrel fit from those that might have used one. Heart felt thanks to all, John

[olde sarge]

UPDATE: Decided on Precision Firearms upper/lower and SLR solo lite forearm. Am trying to be patient and sit still while waiting. I'm to damned impatient when I get something going that I really want. Mark told me would be done by 15 Sept. Pretty much a Precision Firearms rifle except I am going to assemble myself. Still haven't ordered the trigger but have pretty much solidified my choice as a Hyperfire , either the 24 or 24E, depending on what I can find out about their application for use on a precision hunting build. I think I will use IMR8208XBR if I can find an 8# jug in the next month but do have several of the other appropriate powders on the shelf. Well back to reading and lurking for a while longer. John

[Slappy]

You will not be unhappy about your choice. I have 2 now from PF and they are very nice rifles. Pf builds some nice stuff and the advantage I see there is if there is ever anything that goes wrong just call him up and he can fix it. Good guy/s and girls at PF. BANG BANG!!