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April 17, 2014

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Leigh

John

ShotGunNews', Steven Matthews has been doing an article on 80% receivers in the last two "glossy" paged issues. They provide some machining details, and a few different manufacturers in the article. Basically, someone with a decent drill press and a Dremel tool could finish one out.
What I need to do now, is to find someone who has done a review on Squalto's Flat Spot receiver. Which is essentially a steel laminated version of yours. I'll let you know what I find.
Interesting choice of cartridge, by the way. Should have plenty of wallop.

Leigh
Whitehall, NY

john jay

leigh:

the lams culd be built from anything, so long as an adquate structure carries the loud.

plastic. wood. wood impregnated w/ resin.

i am tempted after i build my next laminated receiver, (from wood), to try resign impregnated/fiberglassed cardboard.

if i can figure out how to prevent it from compressing during fabrication and/or use, i think it would work just fine. it has excellent strength in line with the corrugations, and steel clads would protect it from tension and/or torsion.

did i mention that it is cheap? and, present, just about everywhere?

john

john jay

p.s. did i mention that i get a very big kick out of steve matthews, and try not to miss anything that he writes.

he gets it. jjjay

john jay

leigh:

an interesting comment.--

i really don't see the need for a steel lower receiver for the ar-15 ... it really doesn't sustain any severe or prolonged stress. steel is just overkill.

i have finished reading this months issue of sgn, and the matthews article on 80% receivers. it is his usual good fare, spare and to the point.

i really don't see the need for all the fences on an ar-15 receiver, nor do i much care for all the little springs and detents. i view them as a pain in the butt, and if a guy has enough brains to want to clean his rifle, then take down is easily enough done without the use of captive pins.

but, i like the rifle.

i would make one major, make that two major, changes in the rifle. (the above stuff being on the level of annoyances, and not design flaws.)

i would fabricate the upper receiver from steel. i would leave the rifle a direct gas impingement operation cycle. i would put the operating spring not in the butt stock, but in the upper part of the receiver now occupied by the operating handle, and i would put an operating handle on the bolt carrier as civilized nations have done for years, and as john moses browning & remington & winchester have "got along with" for decades.

i don't understand the need for the operating handle being where it is, nor in functioning as it does: it strikes me as, well, stupid.

anybody up for a homemade ar-15 in .50 bmg? laughing.

john jay

john jay

leigh:

just back from squalto's "flat spot" website.--

interesting. if a person has the welding skills to put it together without warping the thing gauge steel, it would certainly be serviceable, and would probably last just about forever. and ever. and, ever.

at one point in my checkered past i was head night sawyer at key equipment company, a company that made food processing equipment. we used a lot of stainless steel, and a lot of it was welded.

you just have to know what you are doing with steel when you weld it, or it will go all over everywhere.

i have seen lower receiver plans using aluminum plates, which are easily formed, and then fastened together w/ cap screws and the like after holes are drilled.

very similar in concept.

and, requiring no welding skills, nor any other process that would stress and warp the aluminum plate.

i would prefer that route to welding. but, if you had the skills, and the knowledge how to put the thing together, the steel receiver would most certainly "work." and, then some.

in the mean time i will stick with my walnut and steel clads, and i am gonna do some screwing around w/ cardboard & resin.

but, if "flat spot" ever figures out how to make an upper from sheet metal, i would be most interested in seeing how all of that is put together.

trunions? the threaded part of the front fabricated separately and then joined to the receiver, which is basically a glorified tube?

whatever. it would be interesting.

john jay

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