Decisions decisions... HK flats

KIBarrister · Jan 21, 2022

While we are on this topic, any specific thoughts on the unistrut jig? I have enough length I was planning to cut two sections specific to the length of the g3 (which will be just silly in pistol configuration) and mp5. I’m welding a six inch section to the ends 90* to the main length for the 20mm rod to ride in vertically, and using 1/4 all thread through the alignment holes in the flats.

I also have the 3D jig fully printed for cetme size receivers and am printing an alternative half today that will make the jig align with mp5 holes. I have seen positive reviews of both methods, but in the off chance anyone has tried both and can give a comparison of pros/cons....

KIBarrister · Jan 21, 2022

Sit rep:

HKP won so it went first. Attempted the 3D jig. Warning: it will not work for mp5 style due to the internal mount of the shell deflector. I made a relief for it thinking I was smart and then realized as it was half bent that dog wouldn’t hunt, it would keep the mandrel locked in the bent frame.

That said, I’m impatient and said F it and tossed it in my length of unistrut with a simple 20mm hardened steel rod on top. Twenty minutes of shaping for a couple high spots, some clamps a few spot welds later and, viola, drop test success. (Yes I need to dress that weld that will sit under the trunnion - kid came out and distracted me...)

I’m not giving up on the 3D jig yet, it actually held up darn good, and for a cetme/g3/etc pattern there is no internally mounted shell deflector.

KIBarrister · Jan 23, 2022

For those curious, the HKP flat is the same gauge/thickness as G3 flats from both vendors; the RRTG flat is eleven thousandths thinner.

BrianS · Jan 26, 2022

KIBarrister said:
Sit rep:

HKP won so it went first. Attempted the 3D jig. Warning: it will not work for mp5 style due to the internal mount of the shell deflector. I made a relief for it thinking I was smart and then realized as it was half bent that dog wouldn’t hunt, it would keep the mandrel locked in the bent frame.
.

I bit the bullet and picked up one the insanely priced HKP versions. It has the relief milled out and worked pretty well.

KIBarrister · Jan 27, 2022

Nice! I may pick one up for future flats; but the unistrut method w/ 20mm bar was surprisingly effective. And the triple taco 3D mandrel from WG is also very good.

KIBarrister · Mar 14, 2022

Kraut space magic, or how I learned to stop worrying and love roller delayed...

(Ended up parkerizing and top coating with Molyresin; internal parts then got the oil bath.)

teratos · Mar 14, 2022

That is damned sexy!

outrider58 · Mar 14, 2022

That's haught!!!!

KIBarrister · Mar 14, 2022

Cheers gentlemen! I'm just trying to decide between sticking with irons or going with an MRO on a Scalarworks mount.

outrider58 · Mar 14, 2022

KIBarrister said:
Cheers gentlemen! I'm just trying to decide between sticking with irons or going with an MRO on a Scalarworks mount.

Although not super recent, there are some good sight solutions here:

https://www.hkpro.com/threads/mp5-red-dots-mounts-and-co-witness-thread.441609/

KIBarrister · Mar 15, 2022

outrider58 said:
Although not super recent, there are some good sight solutions here:

https://www.hkpro.com/threads/mp5-red-dots-mounts-and-co-witness-thread.441609/

Cheers! I was looking real hard at the M8 Industries mount, but at the end of the day my eyes much prefer a proper sized window. Settled on an MRO HD (I love donuts of death) on a Scalar mount that will let me still have irons below the optic. I thought the MRO wasn’t compatible with my astigmatism based on one I put on a Scorpion, but it turns out that tweaking the intensity (rather than just turning it up to 11) saves the day.The good Lord willing I’ll have a range report by weeks end!

Rab1515 · Mar 15, 2022

Any one seen the KF5 files that's currently in open beta testing? Its MP5 based using a MP/SP5 bolt/barrel/trunnion, AR trigger group and a 3d printed frame for a roller delayed firearm.

https://youtu.be/de3pwIFbQJA

outrider58 · Mar 15, 2022

Rab1515 said:
Any one seen the KF5 files that's currently in open beta testing? Its MP5 based using a MP/SP5 bolt/barrel/trunnion, AR trigger group and a 3d printed frame for a roller delayed firearm.

https://youtu.be/de3pwIFbQJA

Phil Luty just got a woodie...

smdub · Mar 15, 2022

So basically a Special Weapons/Cohaire SP10 w/ goofy trigger group?

It was an injection molded MP5.

teratos · Mar 15, 2022

Rab1515 said:
Any one seen the KF5 files that's currently in open beta testing? Its MP5 based using a MP/SP5 bolt/barrel/trunnion, AR trigger group and a 3d printed frame for a roller delayed firearm.

https://youtu.be/de3pwIFbQJA

Interesting. Ugly as all hell. Some iterations look like a roller-delayed Hi-Point.

Rockzilla · Mar 16, 2022

teratos said:
Interesting. Ugly as all hell. Some iterations look like a roller-delayed Hi-Point.

looks like a Lego spin-off with rounded edges.

the flats, gonna have to sway to the RTG LSC Flats

-Rock

Decisions decisions... HK flats

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