MidwestPX

Haha, yeah, middy gas, seven twist, extra thick chrome lining, chambered in 5.56. Barrels are HPT/MPI. Pretty legit tubes that rank right up there with BCM and DD, IMO. The receiver itself is a Cerro Forge machined for us. M4 feedramps, laser T-markings, hardcoat anodized. BCG is our standard full-auto rated phosphate BCG with a 9310 MPI bolt, 8620 chrome-lined carrier, investment cast chrome-lined gas key, grade 8 fasteners, Permatex between the key and carrier, and a S7 tool steel extractor. Links to products in each build: Barrel: http://midwestpx.com/product_info.php?cPath=99&products_id=715 Upper: http://midwestpx.com/product_info.php?cPath=52_93&products_id=716 BCG: http://midwestpx.com/product_info.php?cPath=52_97&products_id=626 Handguards: 9": http://midwestpx.com/product_info.php?cPath=19_61&products_id=675 12": http://midwestpx.com/product_info.php?cPath=19_61&products_id=676 14": http://midwestpx.com/product_info.php?cPath=19_61&products_id=677 They'll be available pre-assembled eventually however I want to get some rounds on the initial units and make sure everything's been worked out as far as the build process so I can make sure we're turning out high quality uppers. I have to wait to get them back from photography but I did weigh the upper with the 14" rail before it shipped and complete with BCG and charging handle, it came out to under 4lbs. These Fortis rails are no joke when it comes to strong but light.

They're all 16" hammer forged Centurion Arms barrels. The only variable is the handguard which are 9", 12", and 14"

Something I've been working on...

Not to my knowledge. The Gen 3s aren't even a year old and they weren't kicked off as a project/idea until nearly three years after the Gen 2s were released and they took over a year of a development time. I'm not aware of any critical flaws with the design so it wouldn't make much sense for Magpul to already be rolling out a new version. Additionally, they'd be updating their 10rd and 20rd designs in addition tot he 30rd if they had a new design because all three use the same body design as well as internal components (spring of the 10rd is out of the old 20 though)

20s are currently only available in black. Magpul has not produced colored Gen 3 mags yet.

We'll have dealer orders caught up by tomorrow then we'll be taking retail orders again.

In theory, a rail mounted sight can move if enough stress is placed on the rail, affecting zero. A FSB is pinned to the barrel and the handguard being free floated is the best of both worlds.

I still haven't gotten one...even after dropping the mag in the middle of shooting the first string of five on the modified Navy qual. That was...embarrassing.

Same here only I load to 28 instead of 30. First class I took with EAG Tactical, Pat berated me for loading my PMAGs to 30 and fighting my carbine when executing a tactical reload. Have loaded to 28 since.

The answer is: it depends. Some OEMs stake the maglock and it's much harder to remove. I don't know if Sig is one of those since it seems they don't ship CA-compliant rifles from their factory. I say this because I have tons of 516 and 716 rifles come through my hands for CA dealers who buy them from Sig and have them shipped to me to have the maglocks installed prior to shipping them on to them in CA.

No

I really need to make room so I dropped the price a bit.

Or because it was crap masquerading as good parts. The last six months have been a nightmare as far as QC/QA is concerned with new outfits springing up to satisfy demand as well as old standbys having to source crap material to work with because there isn't enough good stuff to go around.

I think the pic from M4C shows a mag with 30 (the top round is on the side for either 28, 30 or 32) as I initially thought the same that it was jammed to 31. I'd like to know too what the OP means about manually loading. If he's using a loader, I'd recommend handloading the rounds to see what happens. The block is inside the spring to maintain factory spring dynamics which should translate to factory reliability so I'm very perplexed at what could be happening.

I've got Mega billet lowers in stock

First time I've ever even heard of it and I go through thousands of mags. I'd really like to hear how the mag performs in another AR. If it still fails, I want to look it over myself and I'll replace it.

This. As a retailer, I cannot replace a firearm that has been transferred without the buyer having to do another transfer. A manufacturer, however, can replace a firearm, even with one with a different serial number, without another transfer as they can notify the BATFE that the original serial number was destroyed and replaced with the new serial number. Now, that's speaking from a federal standpoint, NJ may have state-specific issues such as the pistol purchase permit to deal with.

If you can stick your pinky inside the opening of the muzzle device, it's a flash hider. If not, it's a muzzle brake.

Spikes lowers are cut by a few machine shops. As far as I know, they're in-spec, quality lowers. Are they as nice as a Mega Arms or Noveske? No. But they also cost 30% less. For those who care about aesthetics as well as functionality, they pay a premium for the "better" brands. Spikes lowers are a good deal at around $100.

Link?

I wonder if anyone at SEI said, "Hey, is this a good idea? What's the potential fallout here?" before doing that? Please don't sue me, SEI.

That doesn't make sense. If the follower has the vertical clearance to accept rounds 10-15, it has the same clearance to load against a closed bolt up until the 15th round. Can you test it in another AR?

Does it fit more than nine rounds at all?

Say what?

That's the other thing I forgot to mention. The platform is designed to be made ready from an open bolt meaning lock the bolt to the rear, insert mag, release bolt with the bolt catch. For those wishing to store an AR for HD purposes with a loaded mag, do as I do and download the mag, seat it, push/pull, and store it.