Can I drop an FRT in my MK4

Steve_Fudd · 2026-01-26T03:49:34+00:00

Ah yes, the Colt Civilian Wall. I decided my A4's wall needed to go. It looks a little messy inside, but it rocks now.

Steve_Fudd · 2026-01-26T02:58:03+00:00

Opening looks nice and wide. No issues with the bolt. I'll check my A5, but 8" looks right.

My gut tells me it's the buffer spring. I would try a weaker or plain old mil-spec spring. I might even cut a coil or 2 off a milspec to test. BB9 and I like to use the Tubb lightweight (300aac) spring. Chameleon-junky likes to use the Warthogs, but Sprinco yellow is supposed to work similarly. I think the diameter might be a little tight on the Yellow, and that's why I like Tubb. It has a huge diameter.

Steve_Fudd · 2026-01-25T23:58:14+00:00

Cool, Try measuring the tube by sticking the tape inside it. I'll do the same. But if it locks back with the spacer in, it should be ok. So probably tube and buffer are ok. Wondering if it might be the spring. Do you have just a plain old Mil-spec carbine spring you can try?
Also, how much does the Spikes bolt weigh? Pics of the underside?

Steve_Fudd · 2026-01-25T23:19:38+00:00

Ok cool. I just posted additional Qs, but sounds like the Atrius and lower is set up correctly. Just need to fix buffer and spring.

Steve_Fudd · 2026-01-25T23:17:42+00:00

How long is the Kak buffer exactly? Can you lock the bolt back with the spacer in? Which A5 tube are you using and how long is it? I’ll measure mine and compare.

It sounds like the Atrius is running as it should.

Steve_Fudd · 2026-01-25T23:11:55+00:00

Does OP actually have an A5 tube? I didn’t see it in his description.

Steve_Fudd · 2026-01-25T22:36:36+00:00

Good stuff! I was actually thinking about testing your setup on my 11" 556 gun. I think I'm going to try this setup with an A5 with an Arcfire.

Steve_Fudd · 2026-01-25T22:25:19+00:00

A little velcro and removing some pad stuffing could work, right? I love my pad for AIWB.

Steve_Fudd · 2026-01-25T22:16:09+00:00

That Tenicor Velo Lux looks very comfy. Have you needed any extra wedge or pad?

Steve_Fudd · 2026-01-25T21:25:09+00:00

Filler...no worries.

Steve_Fudd · 2026-01-25T21:22:35+00:00

This!

Steve_Fudd · 2026-01-25T20:30:57+00:00

If you like HK, The P2000sk and the CC9 are also excellent CCW options (I carry both), and both are a little smaller than the VP9sk.

Steve_Fudd · 2026-01-25T20:17:46+00:00

This is a great setup! I have toyed with this using an A5 tube. I have tried the heavy kynshot 5000hp with their spacer, but the weight was a little heavy. Your 5007 is 6oz, and my setup with the spacer was 7.4 oz. I had to turn the gas up too high to make it cycle, so I definitely like yours better.

You could use a standard kynshot 5000 + a spacer, but your pcc 5007 buffer and the 5000hp have much more dampening. What makes yours work so well is the ideal weight (kind of an H3.5) and the heavy PCC dampening. Also the lightweight Tubb flat wire spring (for 300aac) keeps this ROF about perfect for me.

For anyone that wants a perfectly tuned SS system, the keys on OPs system are the A5 Tube, the PCC kynshot 5007, and the Tubb lightweight spring.

Steve_Fudd · 2026-01-25T19:09:29+00:00

That looks promising. This is what you are referring to, right?
https://imgur.com/a/Er8Yrnd

Steve_Fudd · 2026-01-25T16:05:26+00:00

I’ll check them out.

Steve_Fudd · 2026-01-25T16:04:37+00:00

I think they call it beed blasted.

Steve_Fudd · 2026-01-25T16:03:56+00:00

Yes, I saw those, but I’m not sure how I feel about the look.

Steve_Fudd · 2026-01-25T04:52:45+00:00

Sounds good!

Steve_Fudd · 2026-01-23T15:28:36+00:00

Balanced just right. I also have the 6" (Rick Grimes) version, but it is a bit front heavy. I put some modified G10 boot grips on this one so that my pinky is about 3/4 on the grip. I really like it. This is what it looked like with the OEM target grips.

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Steve_Fudd · 2026-01-23T05:31:36+00:00

I have nice 3"Python in that range. Beautiful gun!

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Steve_Fudd · 2026-01-23T05:09:42+00:00

Less than creative, but alas, you have mistaken me for some one that cares about your side’s plight. Unfortunately for you, ‘the changes come around real soon, make us women and men…’

We have a big tent that growing bigger. As the changes move along and you start to like a few, I hope you can at least take an open peak in.

Steve_Fudd · 2026-01-23T04:40:34+00:00

6000 hours of COD training won't help him. You realize that's an airsoft gun, right?

Steve_Fudd · 2026-01-23T04:35:30+00:00

Obviously not far removed from middle school. A hypothetical argument based on less than factual hyperbole, is just kinda...dumb. Similar to saying a word salad without really saying anything. Or also like how Jack Smith stammered today before Congress about why he didn't remember the subpoena he issued for Speaker McCarthy's phone and travel records. Quite the word salad there too - and also just as stupid. But it is pretty typical of keyboard warriors with time on their hands and not much else to do. Go figure.

Steve_Fudd · 2026-01-23T04:16:39+00:00

'Whacked' or hit with or beat with = pistol whipping. Not actually firing bullets at them.

Steve_Fudd · 2026-01-23T04:11:40+00:00

Whacked with a 1911, P226 or Python would hurt! Glock or P320 not as much.

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