Standard line · Mk1

Sentinel Standard

MK1 · AR-15

In stock — built to orderICA-XXXXXAmbi controls standard

The flagship Ironcrest rifle and the same platform our patrol-rifle departments carry. Machined and serialized lower, assembled in our shop, headspace checked, function checked and test fired before it leaves.

Tier — variant

Price

$849

Base configuration · Virginia sales tax at checkout

Cosmetic engraving — optionalCosmetic text or logo work only. The serial and its prefix are never customer-selected on a complete build.

Configure this build

Serialization

This rifle serializes under the standard civilian scheme — ICA-XXXXX, five sequential digits, engraved on the lower receiver and recorded in our A&D bound book. No prefix selection appears in a complete-build flow.

Specification — Sentinel Standard

SENT-MK1-STD

Component	Specification	Value
Lower receiver	Ironcrest-manufactured, serialized and engraved in-house	ICA-XXXXX
Model designation	Mk1 — standard rifle	AR-15
Caliber	5.56 NATO / .223 Wylde	5.56
Pre-delivery	Headspace check, function check, test fire	Documented
Upper receiver group	PSA-tier, forged	Included
Trigger	Mil-spec single stage	Included
Barrel	16" M4 profile, 1:7 twist — placeholder, confirm from catalog	4140 CMV
Furniture	M4 stock, A2 grip	Included
Weight	6.4 lb — placeholder	Unloaded
Safety selector	Ambidextrous, 45°/90° throw	Standard
Bolt catch / release	Ambidextrous, left-side paddle	Standard
Magazine release	Ambidextrous, both sides	Standard
Ambidextrous upcharge	None at any tier	$0

Content slot — barrel, twist, gas system and weight values per tier to be confirmed from the current civilian catalog before launch. Values shown as placeholders are marked in the table.

What happens after you order

01
Order confirmed
Your order and payment are recorded in our commerce backend. You get a written build confirmation with the tier and options you chose.
02
Build and serialize
The lower is machined, engraved with the ICA serial and logged in the bound book. Assembly, headspace, function check and test fire follow.
03
Appointment
We call you to schedule. Drop-ins are not possible — the facility is industrial and appointment-only.
04
Transfer
Form 4473 and background check at pickup, in person, with government-issued photo ID.

Law enforcementSentinel as a patrol rifleDepartment configuration, quote-based procurement, armorer support and off-hand qualification notes.LowersStripped lowerBuild it yourself. The one order type where an IC-prefixed custom serial option can be requested.SOT Class 2Make it an SBRForm 2 manufacturing, ATF engraving and Form 4 back to you. No $200 stamp since January 1, 2026.