Modern Sporter - Build Discussions

Geissele Mk14 finally installed, but there's a sizeable gap between the rail and the receiver, just shy of 1/16", so the gas tube is visible through the gap.

Everything sits perfectly flush until I thread the cross bolts through, so it's due to the interaction of nut and receiver threads. I've uninstalled, seasoned the threads and taken it a little past torque spec, but the gap remains.

Anyone else have a 1st run FA upper? How's your hand guard fit?

Any guesses as to which part is the out of spec one?
 
J.L.C. said:
Geissele Mk14 finally installed, but there's a sizeable gap between the rail and the receiver, just shy of 1/16", so the gas tube is visible through the gap.

Everything sits perfectly flush until I thread the cross bolts through, so it's due to the interaction of nut and receiver threads. I've uninstalled, seasoned the threads and taken it a little past torque spec, but the gap remains.

Anyone else have a 1st run FA upper? How's your hand guard fit?

Any guesses as to which part is the out of spec one?
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I’ve fit 2 of these mk14 handguards and both have gaps. I actually prefer more gaps so if I mount my optics at the most forward position on my receiver, it won’t touch the handguard. But that’s just me.
 
Icelvlan said:
For a first build, does anyone think it is possible to spend under $1000 for parts after purchasing upper/lower sporter?
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Yes.

However it totally depends on the quality of parts you want , if you have the proper tools to assemble and if you are ok with waiting for sales or buying the odd used part.
I picked up a few used parts and a few new ones. Built my Sporter for around $2200 including receiver cost.
 
Icelvlan said:
For a first time builder, is there a guide on parts required?
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I’m a first time builder as well and I just did a bunch of research on parts before I spent any money, unfortunately I wasn’t able to keep the cost of my parts under 1000 but I was pretty close got some good deals on here in the EE
 
Icelvlan said:
For a first time builder, is there a guide on parts required?
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Lower parts kit
Barrel
Gas tube
Gas block
Handguard
Muzzle device
Bolt carrier group
Buffer tube kit
Stock
Grip
Magazine
Charging handle

I think i got it all. Also if you're doing a modern sporter a clamshell type upper vise block doesn't fit, get the reaction rod type that inserts into the barrel for tightening barrl, you'll also need some punches, a bench vise, AR armourers tool ideally.
 
Unexpected said:
I’m a first time builder as well and I just did a bunch of research on parts before I spent any money, unfortunately I wasn’t able to keep the cost of my parts under 1000 but I was pretty close got some good deals on here in the EE
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Trying to keep parts under $1000 is pretty unrealistic unless you get a PSA 20in A2 Rifle from IRG as a doner rifle...

So $1000 in parts plus $2400 for a receiver set on the EE if you are lucky enough to get it in the first 5 mins of being posted... too bad the supply is dramatically under the demand these are amazing rifles.
 
LeadMonkey said:
$2400 for a receiver set on the EE
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I might be missing something here. Receivers are only like $1200 after tax. Are you just saying that it's either wait for one from ATRS OR spend Double in the EE? If you want a cheaper Modern Sporter, waiting seems like the way to go.

I am thinking about getting one and am deff looking for a cheaper way to do it. So many people on here have $4.5k MS and I never understood it, but then again I am more a "spend less on the gun more on ammo and practice" kinda guy.



Edit: And now I can never post again because I am 13 years old and I don't wanna ruin my post count.
 
Last edited:
Hi all this is my first build and so far the lower went together no problem except the bolt catch retaining pin doesn’t want to go flush in the hole am I using the wrong pin or is this common?
 
trimeal1 said:
I am thinking about getting one and am deff looking for a cheaper way to do it. So many people on here have $4.5k MS and I never understood it, but then again I am more a "spend less on the gun more on ammo and practice" kinda guy.
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You can build them for around 2K. Mine have been 3500-5500$ without optics and all payed regular price. Just depends on what you want in a build.
 
trimeal1 said:
I might be missing something here. Receivers are only like $1200 after tax. Are you just saying that it's either wait for one from ATRS OR spend Double in the EE? If you want a cheaper Modern Sporter, waiting seems like the way to go.

I am thinking about getting one and am deff looking for a cheaper way to do it. So many people on here have $4.5k MS and I never understood it, but then again I am more a "spend less on the gun more on ammo and practice" kinda guy.



Edit: And now I can never post again because I am 13 years old and I don't wanna ruin my post count.
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NICE!



I think most people, me included, spent 4-5k on these because of the long wait and the ability to spread out that cost. I have a couple and I waited for sales like on the 4th of July, Labor Day, Black Friday etc. In all, I think I saved about 15-25% on all other parts besides the receiver set. My lowers are the exact same except for triggers
 
I’m under $1000 on top of the receivers with all new parts except the hand guard was used. Includes a hiperfire trigger

DPMS LPK for $50
Toolcraft bcg $180
Trigger $180
MRA barrel (blem sale) $200
MRA Gas block/tube $95
MRA brake $80
7075 buffer tube assembly $8
Magpul stock $30 off the EE
Picked up a beat up MRA handguard for a hundo off the EE.

I’m sure if I went more used and it could have been cheaper
 
ATRS Shaun said:
I'm not sure how well this will work... but you can try it, I copy and pasted what I've got offline in an Excel sheet for plotting builds into a google spreadsheet. MS Builder Sheet
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I dont know if I want to detail it all out for my friend in Canmore`s build. Its a quality build with not much skimping and its getting up there for sure.

If said friends wife saw the final figure on such a list she would probably have something (unpleasant) to say........
 
Sniffer said:
I dont know if I want to detail it all out for my friend in Canmore`s build. Its a quality build with not much skimping and its getting up there for sure.

If said friends wife saw the final figure on such a list she would probably have something (unpleasant) to say........
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Intention was to have it available for people to print off, fill in by hand, and then store near the shredder. ;-)
 
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