Comstock Armory RPA Recessed Suppressor Adapter Plan-B HUB 1.375-24 Black Nitride
User Ratings
No ratings yet
Be the first to review this product
Overview
The Comstock Armory RPA (Recessed Profile Adapter) is a recessed suppressor adapter compatible with Rearden and other common Plan-B muzzle devices.
Key features
- Plan-B compatible (taper-mount) quick attachment/removal with Plan-B muzzle devices
- Recessed profile creates a tighter handguard-to-suppressor gap and shortens the overall suppressor system length vs. standard LPA
- Lightweight steel construction at 2.1 oz
Construction & finish
- Material: 17-4 PH precipitation-hardened stainless steel
- Finish: black nitride
Threading & tooling
- Thread pitch: 1.375-24 (HUB/Bravo standard)
- Wrench flats: 1-7/16 in
- Spanner notches: 1.5 in
- Added length: 0.18 in
- Recess depth: positions the muzzle device 0.40 in deeper than standard LPA
Fitment note
Verify your muzzle device and suppressor combination will provide sufficient clearance for the recessed design (muzzle devices positioned 0.40 in deeper vs. standard LPA).
Specifications
- Manufacturer:
- Comstock Armory
- Category:
- muzzle-device
- Weight:
- 2.1 oz
- UPC:
- 850069580285
- MPN:
- RPA-B-SS
- Required Component:
- No
Parts Cabinet
Track parts you own or plan to buy.
Where to Buy
Have one to sell?
Sponsored
MantisX
The smart way to train your AR build
Built your rifle — now train it. BlackBeardX installs in minutes and turns your AR into a full dry fire system with smart feedback on every pull.
Shop BlackBeardXPrice History
Current
$79.00
Lowest
$79.00
Highest
$79.00
Price Alert
Sign in to save a target price and receive an email when this component drops.
Sign In to Set AlertSimilar Products
SureFire 3-Prong Flash Hider 5/8-24 TPI
Surefire
$134.00
Wolfpack Armory Night Howler Recessed Flash Hider 1/2"-28 Nitride
Wolfpack Armory
$94.00
SureFire WARCOMP AR-308 Flash Hider 30 Cal 5/8-24 Stainless Steel Black
Surefire
$152.00
A2 BIRDCAGE Flash Hider
Unknown
$15.00
KAK Industry Plan B Universal Muzzle Device
Kak Industry
$37.99
SilencerCo ASR 3-Port Muzzle Brake 1/2x28 for 5.56 NATO AC142
SilencerCo
$79.99
Yankee Hill Machine Phantom 5.56mm Comp/Flash Hider YHM-28-5C1 Smooth Endcuts 1/2x28
Yankee Hill Machine
$28.03
Daniel Defense Flash Hider 1/2-28 AR-15 5.56/223 Suppressor
Daniel Defense
$51.00
Builds Using This Part
No builds yet — be the first to use this part.
Related Guides
Guide
The AK Platform: Core Design, Strengths, and Builder Tradeoffs
A practical AK overview covering operating system basics, parts ecosystem realities, and where the AK platform shines compared to AR-pattern rifles.
8 min read
Guide
AR-15 Armorer's Toolkit: What You Actually Need
A no-filler breakdown of the specific tools required for AR-15 armorer work, from trigger and grip swaps to barrel installation and headspace verification. What each tool does and why it matters.
7 min read
Guide
AR-15 Components: A Complete Reference Guide
A comprehensive overview of every major component in an AR-15 build—including what's inside bolt carrier groups and parts kits—organized by assembly for new builders.
12 min read