They don't use A1 lower receiver, its all A3 receivers. If someone else wants to be build 100% exact copy then my god i'll give you a golden cup award, but since not everything can be done in airsoft example, trademarks, the difference of .2 inches in barrel length etc... You couldn't tell them from far apart or side by side.
Give Amazing KG3 a break, at least he is willing to spend his time and money to build something what he wants similiar to Mk18.
Quoted from Wiki
Quote:
* Upper and lower receivers: The lower receiver is a standard M4A1 lower receiver with no modifications. Internally, the CQBR also takes advantage of a larger gas port and modified bolt carrier and buffer assembly. The gas port has been opened to 0.070 in (0.18 mm). The charging handle is a big-latch M84 Gas Buster, manufactured by Precision Reflex, Inc.
* Sights: Initially, detachable carrying handles cut down so that only the rear sight assembly was used. However, most of these have been replaced with the similar commercially-made Lewis Machine & Tool rear sight.
* Stock: A variety of M4 retractable buttstocks are used on a standard 4-position receiver extension. Most often seen is the SOPMOD stock, often referred to as the "Crane stock", created by Dave Armstrong of NSWC-Crane. The angled stock offers better cheekweld as well as providing two storage compartments for spare batteries. The stock must be removed from the weapon to access the storage compartments. The initial run of stocks was made by NSWC-Crane from glass fiber polymer. Because of this, they were somewhat fragile and did not always properly lock into the receiver extension. A rubber band was used to secure the latch so it would not slide out of the desired position. The current SOPMOD stocks are made by Lewis Machine & Tools and have none of the problems.
* Barrel: The CQBR uses a standard 1:7 in (178 mm) twist M4 barrel that has been reduced in length to 10.3 in (262 mm). The diameter of the barrel under the handguards is 0.625 in (16 mm). The KAC QD flash suppressor is fitted, allowing use of the KAC QD Suppressor (National Stock Number 1005-01-437-0324). Although it has a bayonet lug, the CQBR is not meant to be fitted with one.
* Handguards: The standard handguard for the CQBR is the Knight's Armament Company Rail Interface System (RIS; National Stock Number 1005-01-416-1089), which allows for the usage of any accessories that are compatible with MIL-STD-1913 Picatinny rails.
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