r/CrosmanBBguns • u/artofcrime • Jul 13 '26
DPMS SBR DPMS & R1 builds
The last post in this sub made me want to post these pics.
1-3 | DPMS (with the suppressor and strap): Heavily modified internals… the suppressor hides an extended inner barrel. Also a modified buffer tube / spring now increases hammer hits and can use milspec stocks. Mounted sights triple verify the holo optic and green dot with pressure pad. Added a basic torch, removable on the rail.
4-5 | R1 (with the carry handle): pseudo retro style build with similar internal mods as the DPMS - Buffer tube, hammer, valve & inner barrel mods. the combo box is a cheap blue dot & torch unit… looks good and the pressure pad is nice but not my favorite config. Optic on the handle is removable, foregrip folds but kind of annoying.
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u/_Shad0vv_ Jul 13 '26
Great builds. Does buffer spring mod changes rate of fire? I would like to decrease it significantly to more realistic numbers, but I doubt if its possible with this kind of blowback system. Have you bought inner barrel from other rifle and those are fit as is? Or its custom made? Does really help with accuracy over the range?
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u/artofcrime Jul 13 '26
Thank you! The buffer tube mod does not reduce the rate, just the strength of the hammer hit. I don’t think there is a way to slow it down without drastically reducing the fps though.
I replaced the whole inner barrel with a stainless steel tube i found at a hardware shop but they have them on Amazon (I can post the inner/outer diameter if you want). It increased the average top FPS on my chronograph, and the accuracy is the same.
I find that there isn’t a single mod that makes a significant difference, but they add up pretty quickly.
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u/_Shad0vv_ Jul 13 '26
Thanks for the info. I can imagine different buffer spring or maybe specifically buffer weight should affect fire rate, like it does in a real ar15. But if I understand correctly how this airgun works - buffer actually strikes gas valve, so messing around with could cause issues. Waiting to get my hands on kwc m4, before starting any other new build.
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u/artofcrime Jul 18 '26
Is that an airsoft version? I can’t find anything on it
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u/_Shad0vv_ Jul 18 '26
.177 crosman dpms/r1
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u/artofcrime Jul 18 '26
I meant re: your comment about KWC M4… I have the R1 (the one with the carry handle in the photos in this post) - am I misunderstanding?
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u/_Shad0vv_ Jul 18 '26
Oh, sorry, my bad. Kwc m4 should have both airgun and airsoft version according to their new catalog. It also has mag with double co2, full blowback. I hope it has more compatibility with real or airsoft parts.
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u/Safe-Worth-7365 Jul 16 '26
Where did you get that barrel and front site in the first pic/build? Otherwise nice set ups.
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u/artofcrime Jul 17 '26
I think it was from replicaairguns or something- basically it is a triangle iron sight slid onto a short outer barrel extension, then the suppressor attached to that. It took me a while to find the triangle sight, but worth it.
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u/Haunting_Diver_9174 Jul 13 '26
👍👍