Is the lower receiver mil spec., so I can change out the upper receiver for a complete 556 upper receiver?

Hi Daniel and welcome. The lower receiver is metal reinforced polymer and will accept a 5.56 upper without issue. Cheers, stay safe and enjoy!

Hi Daniel, according to ATI, the receiver and all the components are mil-spec. Stay safe & have a great day!

Is there a complete spec. list or a link to look it up?

Hi Daniel and welcome. Full Specifications listed here: Caliber/Gauge: 300 AAC Blackout Action: Semi-Auto Barrel Length: 16 inches Rate-of-Twist: 1-in-8 inches Capacity: 30+1 Magazine Included: One 30-round magazine Stock/Grips: MM4 Stock / A2 Pistol Grip Finish: Black Receiver: Metal-Reinforced Polymer Sights: No Sights Sight Type: None Thread Pattern: 5/8x24 Special Feature: Threaded Barrel Safety: Two-Position Thumb Safety Weight: 5.5 lbs Shipping Weight: 8.15 lbs Additional Features: Hybrid Polymer Upper & Lower, 15-inch M-LOK Handguard -- Cheers, stay safe and enjoy!

UPC is not coming up on manufacturers website. All I could glean elsewhere is: Specifications Type Rifle Action Semi Automatic Caliber/Gauge .300 Blackout Capacity 30 Barrel Length 16 Twist 1-in-8" Sights No Sights SKU LNG-ATI-ATIGOMX300QD15 License Requirement FFL Manufacturer ATI Mfg. Part Number ATIGOMX300QD15 UPC 810113114217

The ATI UPC 810113114217 corresponds to the ATI G2 Milsport AR-15 rifle. Here's a detailed spec list for this model: ATI G2 Milsport AR-15 (UPC 810113114217) Specifications: Caliber: .223 Remington / 5.56 NATO Overall Length: 32.25" (collapsed) / 35.75" (extended) Barrel Length: 16" Barrel Profile: M4 Contour Barrel Material: 4150 Chrome Moly Vanadium Steel Barrel Finish: Nitride Barrel Twist Rate: 1:9" RH (right hand twist) Gas System: Direct impingement (Mid-length gas system) Muzzle Device: A2 Flash Hider Upper Receiver: Forged, A3 Flat Top, with Picatinny Rail Lower Receiver: Forged 7075 T6 Aluminum Handguard: 15" Free-Floating M-LOK Rail Trigger: Standard AR-15 Trigger (single-stage) Sights: None (this rifle typically does not come with iron sights, but it's optic-ready) Stock: Milspec Adjustable Stock Pistol Grip: Standard AR-15 style grip Weight: 6.7 lbs Finish: Matte Black (both upper and lower receivers) Magazine Capacity: Typically comes with a 30-round capacity magazine (may vary by configuration and region) Additional Features: Mil-Spec Buffer Tube Ambidextrous Safety Selector

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American Tactical Imports Omni Hybrid Maxx .300Blk 16" 30rd - 30 Rounds | 16" Barrel

Name: American Tactical Imports Omni Hybrid Maxx .300Blk 16" 30rd
Brand: ATI
SKU: 411561818
Availability: InStock

2 Questions & Answers

Model: ATIGOMX300QD15

Condition: Factory New

Bud's Item Number: 411561818

UPC: 810113114217

MFG: ATI

Questions & Answers (2)

American Tactical Imports Omni Hybrid Maxx .300Blk 16 30rd

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Specifications:

UPC: 810113114217

Model: ATIGOMX300QD15

Barrel: 16" 1:8

QD Rail: 15"

Stock: 6 Position M4

Magazine Capacity: 30rd

Product Information

Capacity

Barrel Length

Action

Semi-Auto

Caliber/Gauge

300 AAC Blackout

Item Type

Rifle

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American Tactical Imports Omni Hybrid Maxx .300Blk 16" 30rd

Model ATIGOMX300QD15	Condition Factory New
Bud's Item # 411561818	UPC 810113114217
Manufacturer ATI

Specifications:

UPC: 810113114217

Model: ATIGOMX300QD15

Barrel: 16" 1:8

QD Rail: 15"

Stock: 6 Position M4

Magazine Capacity: 30rd

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Questions & Answers

Q: Is the lower receiver mil spec., so I can change out the upper receiver for a complete 556 upper receiver?
Answered

Asked 02/14/2025 03:36 by Daniel C

A:

Hi Daniel and welcome. The lower receiver is metal reinforced polymer and will accept a 5.56 upper without issue. Cheers, stay safe and enjoy!
See 1 more answer |
Q: Is there a complete spec. list or a link to look it up?
Answered

Asked 02/09/2025 03:42 by Daniel C

A:

Hi Daniel and welcome. Full Specifications listed here:
Caliber/Gauge: 300 AAC Blackout
Action: Semi-Auto
Barrel Length: 16 inches
Rate-of-Twist: 1-in-8 inches
Capacity: 30+1
Magazine Included: One 30-round magazine
Stock/Grips: MM4 Stock / A2 Pistol Grip
Finish: Black
Receiver: Metal-Reinforced Polymer
Sights: No Sights
Sight Type: None
Thread Pattern: 5/8x24
Special Feature: Threaded Barrel
Safety: Two-Position Thumb Safety
Weight: 5.5 lbs
Shipping Weight: 8.15 lbs
Additional Features: Hybrid Polymer Upper & Lower, 15-inch M-LOK Handguard
-- Cheers, stay safe and enjoy!
See 2 more answers |

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American Tactical Imports Omni Hybrid Maxx .300Blk 16" 30rd - 30 Rounds | 16" Barrel

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Q: Is the lower receiver mil spec., so I can change out the upper receiver for a complete 556 upper receiver?

Q: Is there a complete spec. list or a link to look it up?

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Questions & Answers (2 Questions)

Questions & Answers

Q: Is the lower receiver mil spec., so I can change out the upper receiver for a complete 556 upper receiver?

Q: Is there a complete spec. list or a link to look it up?

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