AR-155.56 NATO
AR-15 5.56 Barrel Length Guide
Quickly compare 11.5" through 20" configurations with velocity, range, and OAL visuals to match your mission.
Updated with suppressor notes and gas system tips.
Build AR configurations that actually work.
Mission-driven. Data-backed. Field-tested.
Our assistant pairs your intent with a vetted catalog and reference guides. Understand the tradeoffs before you buy parts, compare configurations, and document what actually works in the field.
127
Platforms mapped
2,400+
Components
Live
Ballistics data
DDM4 V7
Home Defense
Duty Use
Score: 87.3
Added Components
• Vortex Viper
• Modlite PLHv2
Capability Analysis
Platform + Components
Platform
Current
AI Assistant● Active
Why choose this toolkit
Whether you're building a suppressed CQB blaster or a precision SPR, pair the configurator with our growing repository of mission-focused knowledge.
Intent-driven builder
Capture mission, environment, and experience to filter platforms and surface compatibility notes powered by the guided assistant.
Logbook & range diary
Track range sessions, maintenance intervals, and guided drills with live timers that keep you honest under the clock.
Curated catalog
Reference components with verified tagging, compatibility families, and capability scoring so you can assemble reliable stacks.
Guides that matter
Supplement decisions with quick visualizations and callouts for ballistics, ergonomics, and legal considerations.
Latest guides
Fast references that translate platform theory into range results.
Read guide
AR-15Buying guide
AR-15 Brand Comparison Ladder
Contrast PSA, Aero, BCM, DD, LMT, KAC, Geissele, Sig Sauer, Smith & Wesson, and Noveske across price tiers, QC, and mission fit.
Breaks down value tiers, support policies, and upgrade paths.
AR-15Components
Muzzle Device Selection Guide
Compare flash hiders, compensators, brakes, and hybrids with decision matrices for mission-driven device selection.
Performance metrics and use-case recommendations included.
Coming Soon
This configurator evolves with your feedback. Here's what we're building next.
1
Range day validation
Log chronograph data and felt recoil notes to tune the builder's recommendations with empirical feedback.
2
Library of guides
Expand references to gas system tuning, optic height over bore, suppressor pairing, and caliber crossovers.
3
Team scenarios
Capture multi-role configurations for training groups, comparing overlaps and capability coverage across builds.