MSAR E4 (AUG) Bullpup .223

stmcelroy · Jul 25, 2020

Like new condition MSAR E4 bullpup, takes AR15 mags.

Original owner, comes with factory box and manual.

Upgraded 4-prong flash hider

200 rounds at most through the gun.

Sell for $1450

Trades:
Quality 1911
S&W 329PD
CZ 97BD

drstrangelove · Jul 25, 2020

Curious why there looks to be helicoil in those threads, bottom pic.

Felman · Jul 25, 2020

drstrangelove said:
Curious why there looks to be helicoil in those threads, bottom pic.

lol @ Hellacoil. I'm also curious. Guessing it's from the manufacture due to the polymer?

stmcelroy · Jul 25, 2020

drstrangelove said:
Curious why there looks to be helicoil in those threads, bottom pic.

Felman said:
lol @ Hellacoil. I'm also curious. Guessing it's from the manufacture due to the polymer?

No idea. That's how they all came, it's a casting and those are for accessory rails.

4x401 · Jul 26, 2020

Felman said:
lol @ Hellacoil. I'm also curious. Guessing it's from the manufacture due to the polymer?

Thats exactly it.
Many manufatures install Heli-coil type fasteners in polymer & aluminum parts the will see stresses beyond what the parent material can support. Not unusual at all.

The Heretic · Aug 21, 2020

Not Helicoils, but rather Nutsert type threaded brass. Very common for polymer and aluminum where the host material is not as thick as the insert is long and/or is softer and you need to thread something in that is hard (usually steel).

Nutserts often have knurled ridges around the outer circumference, and, depending on the type of insert, have some type of knurled flattened edge on the side inner to the insert. These help hold the insert in place. It is quite possible that these inserts were in place when the polymer was molded.

Much better than threading plastic itself.