Effect of Delayed Unlocking
- By TonyAngel
- Semi-Automatic Rifles
- 32 Replies
Wow. You do realize that my entire post dealt with adjusting the closed bolt lock time on an AR15, right? What do you think it is that you are doing when you add mass to the BCG/buffer or turn the gas down? You are increasing the closed bolt lock time. Your response leads me to believe that you think adding buffer mass or adjusting the gas is all about bolt velocity. Bolt velocity itself could easily be controlled with the spring and it sounds like you are conflating the two.I think you're making the assumption that an AR can't experience longer lock time or delay without malfunctioning. This is what these products promise. If we see ourselves as having open minds and welcoming efforts of companies trying to achieve this, I think we should at least predicate the discussion on this capability. If you're right, and it's not possible, then your right. But if you haven't tried and tested them and your just eliminating the concept through assumption then it's just an uninformed opinion. I don't say that to be overly aggressive or confrontational. It's just what it is.
I don't see the value in using this product as an alternative to just properly gassing a rifle. To your original point, why? Just build the rifle better and save money. I think it's value lies in extending the capability of longer lock time and reduced ejection port gas after conventional methods have done their best. To give additional performance that can't be gained by more simple and proper build methods. I guess an example of this would be the comparison of the MP5 vs a direct blowback PCC. No matter how you buffer a DBB PCC, it's not going to equate to a roller delayed mechanism.
All this BCG, that we are talking about here, aside from the other attributes, does is effectively make the system think you're running a buffer one or two steps heavier and/or reduced gas. Either extends closed bolt lock time to allow the bolt to unlock when pressure has subsided, consequently slowing bolt velocity.
I run riflespeed gas blocks on my rigs. Although each is a bit different when it comes to tuning, you can tailor the gas adjustment range by changing the plunger. On my longer distance and 300BO rigs, I use plunger sizes that allow me to completely turn the gas off. Its a nice feature to have on tap when target shooting or you want things as quiet and gas free as possible.I have two Griffin Gas Pocket BCG's (one "enhanced" with the shorter gas key for longer stroke, and one 'milspec').
They both, for me, 100% make a suppressed AR quieter. I don't think they changed my gas/overgas all that much, I'm currently running standard A2 buffers with Tubb FlatWire springs and with the suppressors attached, they're overgassed (or were, more below).
Both rifles, with cans, were overgassed. One is a KAC LPR Mod 2 (proprietary gas block/tube) with an OCM5 can, the other is a Bison Fulcrum (proprietary gas block, intermediate gas tube). The KAC LPR has the 'enhanced' GA GP BCG, the Fulcrum has the 'milspec' GA GP BCG.
Since the milspec GA GP BCG has the standard gas key, I replaced the key with a Rubber City Armory Adjustable Gas Key. The RCA AGK tamed the gas on the Fulcrum barrel by limiting the amount of gas that goes into the GA GP BCG and made a softer, more pleasant rifle to shoot. If I wanted to do the same to the KAC LPR Mod 2, I'd need to get a milspec GA GP BCG and swap the key on it. I don't think I will just yet.
I am running pretty spicy loads with 77gr SMK (also 73gr ELDM), AA2520 with NAS3 cases. I was getting odd fliers with the 73gr ELDM and gave up on them after a couple hundred rounds.
This delayed/gas/flier discussion at the beginning has me wondering, what if I shutoff the gas? Yeah, it'll turn it into a single shot but if the pressure/gas is causing the fliers, removing that might fix it? Or not. Maybe.
Just thinking out loud a bit. Something to try this weekend.
On my goto rig, I have it setup so that setting 1 is my base for good cycling when suppressed on a clean rifle.
Anyway, what you're talking about doing isn't in the least bit unusual.