PDW Buffer & Spring Assemblies

Question

Q: I have a undergassed 300 blackout with a SBHBPDW brace what buffer and spring will help it cycle subsonic

Asked by: Matt - 7/2/2026

Q: I have a mixtape (clone) PSA with the maxim type pistol brace, 8.5in barrel, that routinely fails to lock into full battery, whether running subs or supersonic. it is a 300blk using a direct thread .30 Banish from silencer central. I've cleaned it meticulously (pistol and can) and am considering the buffer and spring as the next option before changing the entire gas system. I'm open to suggestions. I was leaning toward the e-series heavy buffer and the light spring.

Asked by: Brian Damage - 6/28/2026

Q: I have a sdpdw brace on a 4.75” 5.56. What do you recommend to lighten up the recoil and possibly switching to a 300bo same size

Asked by: H - 6/1/2026

Q: Hello, I'm running an 8in .300 blk build with an SB HBPDW and I'm having consistent failures to feed. The rifle has an adjustable gas block with a .075 port, a kak downvent bcg, and the gun is run exclusively suppressed with subs. What would be the spring and buffer weight combo you would recommend for this set up?

Asked by: Matt - 5/28/2026

No Answers have been submitted yet.

Q: I will be running the HBPDW brace on a 11.5” BCM .556 upper. It will almost always be ran suppressed. Which kit do you recommend?

Asked by: Cade - 5/22/2026

Q: What weight and spring would work best for a suppressed 8 inch barrel 300blk? I’m trying to run the gun for duty use and as reliable as possible.

Asked by: Dave B - 5/22/2026

Q: I was curious if this would be the best upgrade or replacement to the current dual spring buffer setup I have with my MVB ARC PDW STOCK. I know that it runs a dual spring setup with proprietary buffer, but since there is room to still install the buffer retainer, I wasn’t sure if I could run this instead? The dual spring is basically unobtainium at this point but I don’t want to buy an entire new PDW stock if I can make something like this or a SCS work. . I feel like it would work with the retainer reinstalled since the stock you offer is the same setup.

Asked by: Rvby - 5/19/2026

Q: I have a a honey badger SBR 300 blackout Installed an FRT trigger and assuming I need a heavier spring What is recommended

Asked by: David Davis - 5/19/2026

Q: I am running a 10.3 inch Daniel Defense .300 blk upper with the HBPDW brace and suppressed. Gun is very over gassed. Which combination of buffer/spring do you suggest? Do I actually need an H3 PDW buffer?

Asked by: Brian - 5/11/2026

Q: To whom it may concern, If I’m running a frt on a 300BLK 7.5 pistol AR do I need the heavy spring set or the light compact recommended for the 300BLK?

Asked by: Juan - 5/7/2026

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Accepted Answer

A: We recommend the PDW Carbine and light spring.

Answer provided by: Administrator (7/10/2026)

Accepted Answer

If running subsonic 300BLK SBR you would need the light spring. IF you are running an FRT, you need the PDW light spring for 300BLK running subs on a SBR, and our enhanced bolt carrier. Our patented bolt carrier mitigates bolt bounce which is what FRT suffer from. IF running an FRT here is a video where we demonstrate this: https://www.blackriflearms.com/ENHANCED-BOLT-CARRIERS_c_10.html

Accepted Answer

We are not sure what an SDPDW brace is. If you have a SBPDW you use mil-spec buffer and spring. If you have the SBHB Honey Badger pistol brace which is the SB Tactical Honey Badger then our PDW buffer and spring are compatible. For the 5.56 we recommend using the PDW E-Series Heavy Buffer and PDW Standard Spring and for the 300Blk add a PDW Light Spring with the PDW E-Series Heavy Buffer to tune it for subsonic blackout.

Accepted Answer

We recommend the E-Series Heavy Buffer and PDW Standard Spring. If running the FRT our Enhanced Bolt Carriers have been 100% reliable.

Accepted Answer

This needs follow up questions, can you please contact Charles at 386-410-5162 for tech support.

Accepted Answer

Please call Charles during normal business hours Mon-Fri 9am to 4 pm EST (386) 410-5162. He would need a measurement from you to determine if this is compatible. Thank you!

Accepted Answer

Q Honey Badger is proprietary and not compatible. If you have the SB Tactical Honey Badger Pistol Brace then PDW E Heavy with light spring for 300BLK if you are running it with subsonic ammo. The feedback we have been getting back with customers to get 100% reliability they have been running our buffer/spring and Enhanced Bolt Carrier with buffer technology that prevents carrier bounce.

Accepted Answer

Heaviest PDW buffer we have is 4 oz. If it is severely overgassed we would recommend utilizing an adjustable gas block.

Accepted Answer

We recommend the Light Spring for 300BLK, but you may need to fine tune it with the standard pdw spring with trying to run an FRT; however, we have not seen buffer/spring work to run an FRT alone. What we have found that ties it all together is our Enhanced Bolt Carriers, we have a polymer that we use on the end that absorbs some of the shock which prevents carrier bounce. We have known this due to we run full auto, but now that FRT's are on the market this is what our customers use to resolve their FRT issues. This is a link to our Enhanced Bolt Carriers and on that page is a video that shows our founder demonstrating our Enhanced Bolt Carrier with a FRT compared to an all steel carrier. https://www.blackriflearms.com/ENHANCED-BOLT-CARRIERS-_c_10.html

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