custom 13xx build
Hello all, I’m not sure if “13xx” would be appropriate, considering the amount of changes in my build. I tend to build my Crosman/Benjamin rifles, carbines and pistols from parts, instead of starting with a complete rifle or pistol. But, I digress- here’s the list for the .177 build:
13xx flat top valve
custom 2100 adjustable flat top piston
2100 pump arm
custom main tube
BNM rear cocking breech w/a BAM 50 cocking knob
BNM shroud
BNM 13xx barrel band
2260/Disco trigger w/brass trigger and 2 screw mod
13xx RVA
custom stock
My original intent was to build a shrouded “clone” of a Daystate sportsman II rifle, which is a side-lever pump rifle. But, thinking about it some, I’ve decided to just build it as a standard pumper. No need to complicate the build any more than I’ve already done!! ;D I’m also itching to try it out, and I don’t want to wait anymore!
I’m still waiting on the BNM breech, and I haven’t ordered the barrel just yet either. Nothing special about it, just a standard crosman .177 barrel that’s been cut to length and re-crowned. I just don’t know what length to go with yet. I also haven’t ordered the BNM shroud yet, because of the barrel length and I haven’t decided on how many baffles I want.
I wanted to do something a little different with the trigger, because with the pumpers I’ve seen, most have the 22xx pistol grip, or a Mrod trigger group. I don’t see anything wrong with the Disco/2260 trigger after getting the brass trigger, and doing the 2 screw mod to it. It’s cheap, and feels pretty darn good! It’s more than adequate for the field. I also didn’t want to be stuck having a long pistol, or using a crosman plastic stock. Again, I just want to be different is all.
I’m hoping, once I decide on a stock, that Norm might be able to help out (for a fee of course! 😉 ) and inlet the stock for this build. I’ve narrowed the list down to a Microfit Benchmark stock, or a Boyds rimfire hunter. I’m really leaning towards the Boyds stock because it’s cheaper than the Microfit.
The only problem, as of now, that I can see is the RVA. 1) It’s a 13xx tube, so not too many choices. 2) Because of the BAM 50 bolt knob, I have to be wary of the length of the RVA. But it shouldn’t be too big of a concern.
Sorry for the long-winded post, I just felt the need to share my build with you guys! Here’s a pic of the custom adjustable flat-top piston:
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Caboose,
You are a real character!
With all these airgun ideas in your head, when do you sleep????
It certainly is turning out to be. I’ve found a machinist to do the drilling and milling, I just need to finish prepping the I.D. There’s going to be about 1.30″ of barrel extending past the main tube. .930″ of barrel will be for the LDC adapter. I’m just going to use the go-to crosman steel breech for the top end. I’ll just be using a worked over crosman barrel as well. I’m over budget, and well over time on this particular build, and I want to get it into action. I still need a stock for it as well. I think I’m just going to modify a Disco stock for now. Maybe I’ll have it copied in the future. Or maybe I’ll just dip the stock once it’s fitting nice.
That main tube sounds like work T. What top end have you decided on? How much barrel extending past the main tube for a ldc?
Holy shit it’s been a while! Okay, Updates:
Gmac barrel band, it came in, and it looks great. Not sure If I’m going to use it. It’s heavy, and I’m not sure the brass will handle taking on/off the LDC repeatedly. I plan on removing the LDC for travel, so the carbine packs easier. I have a Blue Fork barrel band that I’m leaning towards using. I also have an LDC adapter that I got a while back from the UK. It’s a glue on (with red loctite), which I prefer, because grub screws could potentially angle an LDC enough to allow clipping. I much prefer an adapter where I would have to heat it up to put it on the barrel for a REALLY tight, concentric fit, but no one makes one.
I’m still working on the main tube- I hope I got the length right!! The I.D. was a tad small, so I’m in the process of honing it out to the right I.D. to work with all the parts. I then need to get it machined with all the holes and slots and such. If I was a little off on the length, I’ll just have to get a new piston made. Not really a big deal.
This will be built as a scout carbine, with a pistol scope mounted on the barrel. I think I’m going to go with a Mac1 mount, as I’m not a big fan of the crosman barrel mounts.
I just wanted to update y’all on this project!
True! I’ve gone over-budget on nearly all my builds… except maybe the hipac builds…
Oh well!! Been there lol!
For what it cost, plus shipping across the pond, it better be!! I think I may have blown my “below a 392” budget! :rofl:
That’s a really nice front barrel band!
This is the GMAC barrel band, w/front sight post, and threads for an LDC. It’s set up for a “factory” barrel, meaning the little step that the 13xx barrels have. This is supposed to be a direct replacement part for a 13xx. Which is fine, I don’t have my barrel yet, so when I order one from MAC1, I’ll ask to get the step machined in.
I like this set up better, because I can choose when to use an LDC, or remove it for travel, etc. Also, as this barrel band is a “direct replacement”, It’ll be easier when machining a main tube. No worries about pivot hole placement and such.
Gmac barrel band that has both threads for an LDC and a front sight
using a 2289’s barrel band and a Crosman Challenger’s front sight base
Using a HPA/Bluefork Design’s barrel band w/o front sight and a Challenger’s front sight base
I’m kicking around the idea of using iron sights on this build- I don’t want to build a scout rifle- although that would be kind of cool w/a pump… a carbine pump scout rifle… Anyhoo, I digress. I like the idea of the threaded barrel band because I can use the LDC around the house for quiet, PC pest kills, and take it off for transport, and if/when I don’t need one… But I also like the challenger’s sight base because I can use a globe front sight… Ughh. I wish I could have someone make a barrel band that has a dovetail for a globe front sight, and threads for an LDC… Why???
Dang T I need links to pixs for all these dang changes lol.
Okay- I’m kind of at a cross-roads with this build… I’ve sold off the BNM breech and .177 barrel, switching instead over to .22 and a standard Crosman breech. I’m kind of torn between:
Gmac barrel band that has both threads for an LDC and a front sight
using a 2289’s barrel band and a Crosman Challenger’s front sight base
Using a HPA/Bluefork Design’s barrel band w/o front sight and a Challenger’s front sight base
I’m kicking around the idea of using iron sights on this build- I don’t want to build a scout rifle- although that would be kind of cool w/a pump… a carbine pump scout rifle… Anyhoo, I digress. I like the idea of the threaded barrel band because I can use the LDC around the house for quiet, PC pest kills, and take it off for transport, and if/when I don’t need one… But I also like the challenger’s sight base because I can use a globe front sight… Ughh. I wish I could have someone make a barrel band that has a dovetail for a globe front sight, and threads for an LDC… Why???
^^ Hardly!! The 392 is better in some aspects, this build is better in others- Now, my proposed QB pumper idea, and a de-tuned .22 version of the Millennium pumper on the GTA- now THOSE are crazy!!
I think the 392 has more swept than this build, meaning the potential for high power is much better. The 392 has beefier components- when compared to a 13xx/2100. But it’s also heavier than my hybrid build.
Now, disregarding the idea change, this build done right, is far cheaper than a 392, and in my eyes a bit more rugged. Steel components, easy disassembly and rebuild if needed, readily available parts… The list goes on! Hell, due to the flat top piston and valve, I may even get a little more velocity- with less pumps. Who knows? I can’t wait to find out though!
😆 converting a 1322 to a 392… Leave it to caboose
Okay- decided to go a different way with the build- way more simple. I’m going with .22, and I’m going to use as many crosman parts as possible. Basically I’m switching from a BNM breech back to a factory Steel breech. I’ll also be getting a prepped .22 barrel from Mac1 when the time is right. Some really good news: The 13xx tube actually fits the Disco stock pretty well- I thought I would have had to fill the channel in a bit, due to the smaller main tube, but I test fitted a 13xx main tube in the Disco stock, and sweet hell, it fit! All I’ll have to do is fill in the gauge hole, fill in any other imperfections, inlet for the pump arm, and cut the stock in two where I’d like… Then it’s off to the dipper… Niiiiice. I can’t wait to get this build done!!!
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between airgun builds, powder burner builds, school and hiking/camping… no time. I can sleep when I’m dead. Too much fun shit to do! Of course, most of the time school is pretty fun.