zzt Posted February 4, 2021 Share Posted February 4, 2021 12 minutes ago, Orlandoech said: your tube is out of spec then, mine fits in every mil-spec tube I have. That may be, but at .994" OD I'm surprised it goes into a mil-spec tube. Next time I have it off I'll measure. Link to comment
Orlandoech Posted February 4, 2021 Author Share Posted February 4, 2021 1 minute ago, zzt said: That may be, but at .994" OD I'm surprised it goes into a mil-spec tube. Next time I have it off I'll measure. Slug could be slightly too large too... but mine fits in 4 different mil-spec tubes I tried. Link to comment
RaylanGivens Posted February 4, 2021 Share Posted February 4, 2021 As I remember the early slug was a little bit oversize... They came out with a second slug that was a bit smaller in diameter and had flat spots on the circumference to let air pass through... Similar to the buffer piston. Link to comment
Orlandoech Posted February 4, 2021 Author Share Posted February 4, 2021 2 minutes ago, RaylanGivens said: As I remember the early slug was a little bit oversize... They came out with a second slug that was a bit smaller in diameter and had flat spots on the circumference to let air pass through... Similar to the buffer piston. The one you described, that is the one I have. Link to comment
zzt Posted February 4, 2021 Share Posted February 4, 2021 I have the newer slug. I think it a Zulu 2.0 tube problem, not an oversize slug. Link to comment
Orlandoech Posted February 4, 2021 Author Share Posted February 4, 2021 Does anyone know if an AR15 or AR10 buffer tube is best to use? Link to comment
Ner Posted February 5, 2021 Share Posted February 5, 2021 17 hours ago, Orlandoech said: so you removed the buffer retraining pin and spring? You just push the buffer back when connecting your lower and upper? Yep Link to comment
Vogel Posted February 10, 2021 Share Posted February 10, 2021 What hydraulic buffer / spring do you recommend for 13" radial delayed blowback PCC with carbine buffer tube? On Blitzkrieg product page it says: This buffer is also an excellent choice for the CMMG radially delayed blowback 9mm guns. https://www.blitzkriegcomponents.com/ProductDetails.asp?ProductCode=RB5000 I'm having hard time deciding between PCC HD buffer RB5015HD and carbine buffer RB5000. Link to comment
Orlandoech Posted February 10, 2021 Author Share Posted February 10, 2021 2 hours ago, Vogel said: What hydraulic buffer / spring do you recommend for 13" radial delayed blowback PCC with carbine buffer tube? On Blitzkrieg product page it says: This buffer is also an excellent choice for the CMMG radially delayed blowback 9mm guns. https://www.blitzkriegcomponents.com/ProductDetails.asp?ProductCode=RB5000 I'm having hard time deciding between PCC HD buffer RB5015HD and carbine buffer RB5000. Do you reload? Link to comment
Vogel Posted February 10, 2021 Share Posted February 10, 2021 2 minutes ago, Orlandoech said: Do you reload? No, just 124gr factory ammo. Link to comment
Orlandoech Posted February 10, 2021 Author Share Posted February 10, 2021 1 minute ago, Vogel said: No, just 124gr factory ammo. Keep in mind, even though you are Radial Delayed, you are still a PCC, not a .223/5.56, so pressures will be higher. I would recommend the HD or SD Buffer, probably the HD but a search might yield you better results on this forum. Blitzkrieg Components 9mm Hydraulic Buffer HD Blitzkrieg Components 9mm Hydraulic Buffer - Standard Link to comment
Orlandoech Posted February 10, 2021 Author Share Posted February 10, 2021 (edited) Ok guys, I have made some changes to my PCC and I love the changes. Changes A5 Buffer Tube (ditched the AR15 Carbine buffer tube) Blitz 5020SS (ditched the Blitz 5015HD w/ 2.5oz Weight/Spacer) Removed .49" Nylon Spacer Re-tuned Load to 129PF Stern Defense 9mm NiB BCG (ditched the Taccom ESSB - still a great BCG though) JP Tuned & Polished Extra Power Carbine 308/9MM Spring (JP-S-OSC-308)(ditched the Sprinco Orange 308 Spring) (I also tried the Sprinco Red Spring with this setup, it was too light causing unburned powder). The PCC is recoiling much softer and smoother. At 25 yards I can consistently split .17-.20 in the A-zone. I can also consistently split .14-.16 in the Head A-Zone at 11 yards. Groups are significantly tighter as well. Between 0-10 yards, I can consistently split .12-.15 in the A-zone. I even tested plate racks both inline and horizontal and poppers with no issues. Overall I am extremely happy with these changes and the way the rifle is running. I ran 500 rounds flawlessly. I have a LIKE NEW Taccom ESSB for sale if anyone is interested, has roughly 100-200 rounds through it. Edited February 10, 2021 by Orlandoech Link to comment
Orlandoech Posted February 10, 2021 Author Share Posted February 10, 2021 If anyone wants/needs more info please let me know. And thanks everyone for their suggestions and setup info. It is much appreciated. Link to comment
Bwillis Posted February 10, 2021 Share Posted February 10, 2021 3 hours ago, Orlandoech said: If anyone wants/needs more info please let me know. And thanks everyone for their suggestions and setup info. It is much appreciated. Jp spring carbine or rifle length? Link to comment
Orlandoech Posted February 10, 2021 Author Share Posted February 10, 2021 (edited) 1 minute ago, Bwillis said: Jp spring carbine or rifle length? JP Tuned and Polished Extra Power Carbine 308/9MM Spring (JP-S-OSC-308) Edited February 10, 2021 by Orlandoech Link to comment
Orlandoech Posted February 10, 2021 Author Share Posted February 10, 2021 (edited) Here is my current setup: UPPER: Davidson Defense PCC Billet Upper Brekke 12" Barrel w/ 4" CompXtension Brekke/Maxamundi CompXguard NLA Extended Charging Handle Stern Defense SD BU9 NiB ECHO BCG Sig Romeo8H 30mm Optic - 25y Zero Sig Romeo3 XL 45-degree Optic w/ JP 45-degree Mount - 25y Zero LOWER: Gibbz G9 Lower (I'm backwards left handed) TechWell Magwell Magpul K2+ Rubber Grip Hiperfire ELC Trigger (2lb pull springs) 2A A5 Buffer Tube (VLTOR on the way as its 7075 aluminum) Blitzkrieg 5020SS Buffer JP Carbine .308/9MM Spring (JP-S-OSC-308) Magpul SL-S Stock Radian Talon Ambi-Safety OEM Glock 33rd Mags w/ TTi +10 Extensions LOAD: Berry's or Xtreme 115gr Bullet Reloaded Brass Alliant Sport Pistol: 3.6gr | 129PF (might bump this to 3.7gr to ensure PF is always met) CCI SPP $#500 or Federal SPP #100 COAL: 1.11x" - 1.12x" Edited February 10, 2021 by Orlandoech Link to comment
jerseyglock Posted February 10, 2021 Share Posted February 10, 2021 33 minutes ago, Orlandoech said: Here is my current setup: UPPER: Davidson Defense PCC Billet Upper Brekke 12" Barrel w/ 4" CompXtension Brekke/Maxamundi CompXguard NLA Extended Charging Handle Stern Defense SD BU9 NiB ECHO BCG Sig Romeo8H 30mm Optic - 25y Zero Sig Romeo3 XL 45-degree Optic w/ JP 45-degree Mount - 25y Zero LOWER: Gibbz G9 Lower (I'm backwards left handed) TechWell Magwell Magpul K2+ Rubber Grip Hiperfire ELC Trigger (2lb pull springs) 2A A5 Buffer Tube (VLTOR on the way as its 7075 aluminum) Blitzkrieg 5020SS Buffer JP Carbine .308/9MM Spring (JP-S-OSC-308) Magpul SL-S Stock Radian Talon Ambi-Safety OEM Glock 33rd Mags w/ TTi +10 Extensions LOAD: Berry's or Xtreme 115gr Bullet Reloaded Brass Alliant Sport Pistol: 3.6gr | 129PF (might bump this to 3.7gr to ensure PF is always met) CCI SPP $#500 or Federal SPP #100 COAL: 1.11x" - 1.12x" You use Federal SPP primers with your PCC! why? Link to comment
Orlandoech Posted February 10, 2021 Author Share Posted February 10, 2021 2 minutes ago, jerseyglock said: You use Federal SPP primers with your PCC! why? why not? Not sure if you know, a “virus” has primers being impossible to find. Sorry I ruffled your feathers Mr. Link to comment
jerseyglock Posted February 10, 2021 Share Posted February 10, 2021 1 minute ago, Orlandoech said: why not? Not sure if you know, a “virus” has primers being impossible to find. Sorry I ruffled your feathers Mr. No, free country but just throwing good Federal primers away on something not calling for it. Link to comment
Orlandoech Posted February 10, 2021 Author Share Posted February 10, 2021 (edited) 3 minutes ago, jerseyglock said: No, free country but just throwing good Federal primers away on something not calling for it. "Free country" is an illusion and "Freedom of Will" is almost entirely gone. I mainly use CCI, but if/when I don't have any, I use Federal. I try to keep the Federal for my CO rig. Edited February 10, 2021 by Orlandoech Link to comment
zzt Posted February 10, 2021 Share Posted February 10, 2021 (edited) 5 hours ago, Orlandoech said: The PCC is recoiling much softer and smoother. Do you attribute that to any particular change? You shed 1.5 oz. by swapping the standard buffer and weight. Your short stroke is about the same with the A5 tube. So why? Edited February 10, 2021 by zzt Link to comment
Orlandoech Posted February 10, 2021 Author Share Posted February 10, 2021 (edited) 26 minutes ago, zzt said: Do you attribute that to any particular change? You shed 1.5 oz. by swapping the standard buffer and weight. Your short stroke is about the same with the A5 tube. So why? I made changes that were recommended to me buy a PCC guy. I made too many at the same time to know what did what, but its significantly better. The BCG is actually 1.5oz heavier (weighed with scale) than the Taccom, but lost 1oz in the Buffer, so that is close to sixes. With the A5 tube, it has a fuller stroke about 1/2" more than the other setup. However, leaving everything as is, only making 1 change, that being AR15 Carbine Tube vs A5 Tube, with the same Spring, it charges so much easier and smoother in an S5 tube. God, maybe its all placebo lol, who knows. I am not an engineer or physicist myself lol. Edited February 10, 2021 by Orlandoech Link to comment
zzt Posted February 10, 2021 Share Posted February 10, 2021 10 minutes ago, Orlandoech said: it charges so much easier and smoother in an S5 tube. I'm not surprised. They recommend a rifle length spring in the A5. You are using a carbine spring. I'm using the same buffer and weight you were using in a carbine tube with either the JP .308 or 5.56 spring. I get no dot bounce at 144 PF, but I do when I drop down to 132. I'd like to get rid of it. Link to comment
bwikel Posted February 10, 2021 Share Posted February 10, 2021 9 hours ago, Vogel said: What hydraulic buffer / spring do you recommend for 13" radial delayed blowback PCC with carbine buffer tube? On Blitzkrieg product page it says: This buffer is also an excellent choice for the CMMG radially delayed blowback 9mm guns. https://www.blitzkriegcomponents.com/ProductDetails.asp?ProductCode=RB5000 I'm having hard time deciding between PCC HD buffer RB5015HD and carbine buffer RB5000. I run a CMMG RDB with the following set up. It is very smooth with very little dot movement. A5 Buffer Tube Blitz 9mm buffer 5015HD with blitz spacer weight Tubbs flat wire spring 124gr reloads running 136 PF With an A5 tube the spacer/HD buffer short strokes the system to the perfect length since the bolt length is the same as a 5.56 AR. Link to comment
zzt Posted February 10, 2021 Share Posted February 10, 2021 4 minutes ago, bwikel said: Tubbs flat wire spring How can you stand the noise? I ran one in a Strike Industries buffer tube and it was so loud I could not hear the bullet hitting steel. Link to comment
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