diff --git a/src/DMAPI/tgs.dm b/src/DMAPI/tgs.dm
index 3f70916664..3225f14d8c 100644
--- a/src/DMAPI/tgs.dm
+++ b/src/DMAPI/tgs.dm
@@ -67,7 +67,7 @@
 #define TGS_EVENT_REPO_CHECKOUT 1
 /// When the repository performs a fetch operation. No parameters
 #define TGS_EVENT_REPO_FETCH 2
-/// When the repository merges a pull request. Parameters: PR Number, PR Sha, (Nullable) Comment made by TGS user
+/// When the repository test merges. Parameters: PR Number, PR Sha, (Nullable) Comment made by TGS user
 #define TGS_EVENT_REPO_MERGE_PULL_REQUEST 3
 /// Before the repository makes a sychronize operation. Parameters: Absolute repostiory path
 #define TGS_EVENT_REPO_PRE_SYNCHRONIZE 4
@@ -190,21 +190,21 @@
 
 /// Represents a merge of a GitHub pull request.
 /datum/tgs_revision_information/test_merge
-	/// The pull request number.
+	/// The test merge number.
 	var/number
-	/// The pull request title when it was merged.
+	/// The test merge source's title when it was merged.
 	var/title
-	/// The pull request body when it was merged.
+	/// The test merge source's body when it was merged.
 	var/body
-	/// The GitHub username of the pull request's author.
+	/// The Username of the test merge source's author.
 	var/author
-	/// An http URL to the pull request.
+	/// An http URL to the test merge source.
 	var/url
-	/// The SHA of the pull request when that was merged.
+	/// The SHA of the test merge when that was merged.
 	var/pull_request_commit
-	/// ISO 8601 timestamp of when the pull request was merged.
+	/// ISO 8601 timestamp of when the test merge was created on TGS.
 	var/time_merged
-	/// (Nullable) Comment left by the TGS user who initiated the merge..
+	/// Optional comment left by the TGS user who initiated the merge.
 	var/comment
 
 /// Represents a connected chat channel.
diff --git a/src/Tgstation.Server.Api/Models/ErrorCode.cs b/src/Tgstation.Server.Api/Models/ErrorCode.cs
index c372458735..cb9a77a786 100644
--- a/src/Tgstation.Server.Api/Models/ErrorCode.cs
+++ b/src/Tgstation.Server.Api/Models/ErrorCode.cs
@@ -234,7 +234,7 @@ namespace Tgstation.Server.Api.Models
 		/// <summary>
 		/// <see cref="Repository.NewTestMerges"/> contained duplicate <see cref="TestMergeParameters.Number"/>s.
 		/// </summary>
-		[Description("The same pull request was present more than once in the test merge requests or is already merged!")]
+		[Description("The same test merge was present more than once or is already merged!")]
 		RepoDuplicateTestMerge,
 
 		/// <summary>
@@ -460,7 +460,7 @@ namespace Tgstation.Server.Api.Models
 		/// <summary>
 		/// Encounted merge conflicts while test merging.
 		/// </summary>
-		[Description("Encountered merge conflicts while test merging one or more pull requests!")]
+		[Description("Encountered merge conflicts while test merging one or more sources!")]
 		RepoTestMergeConflict,
 
 		/// <summary>
diff --git a/src/Tgstation.Server.Api/Models/Internal/TestMerge.cs b/src/Tgstation.Server.Api/Models/Internal/TestMerge.cs
index 6189c0327c..76ee553023 100644
--- a/src/Tgstation.Server.Api/Models/Internal/TestMerge.cs
+++ b/src/Tgstation.Server.Api/Models/Internal/TestMerge.cs
@@ -1,10 +1,10 @@
-using System;
+using System;
 using System.ComponentModel.DataAnnotations;
 
 namespace Tgstation.Server.Api.Models.Internal
 {
 	/// <summary>
-	/// Represents a merge of a GitHub pull request
+	/// Represents a test merge of a remote "pull request".
 	/// </summary>
 	public class TestMerge : TestMergeBase
 	{
diff --git a/src/Tgstation.Server.Api/Models/Internal/TestMergeBase.cs b/src/Tgstation.Server.Api/Models/Internal/TestMergeBase.cs
index d8cc971b5b..c8b87ee4d2 100644
--- a/src/Tgstation.Server.Api/Models/Internal/TestMergeBase.cs
+++ b/src/Tgstation.Server.Api/Models/Internal/TestMergeBase.cs
@@ -9,19 +9,19 @@ namespace Tgstation.Server.Api.Models.Internal
 	public abstract class TestMergeBase : TestMergeParameters
 	{
 		/// <summary>
-		/// The title of the pull request
+		/// The title of the test merge source.
 		/// </summary>
 		[Required]
 		public string? TitleAtMerge { get; set; }
 
 		/// <summary>
-		/// The body of the pull request
+		/// The body of the test merge source.
 		/// </summary>
 		[Required]
 		public string? BodyAtMerge { get; set; }
 
 		/// <summary>
-		/// The URL of the pull request
+		/// The URL of the test merge source.
 		/// </summary>
 		[Required]
 #pragma warning disable CA1056 // Uri properties should not be strings
@@ -29,7 +29,7 @@ namespace Tgstation.Server.Api.Models.Internal
 #pragma warning restore CA1056 // Uri properties should not be strings
 
 		/// <summary>
-		/// The author of the pull request
+		/// The author of the test merge source.
 		/// </summary>
 		[Required]
 		public string? Author { get; set; }
diff --git a/src/Tgstation.Server.Api/Models/TestMergeParameters.cs b/src/Tgstation.Server.Api/Models/TestMergeParameters.cs
index 0697522f6f..fbac15c974 100644
--- a/src/Tgstation.Server.Api/Models/TestMergeParameters.cs
+++ b/src/Tgstation.Server.Api/Models/TestMergeParameters.cs
@@ -8,7 +8,7 @@ namespace Tgstation.Server.Api.Models
 	public class TestMergeParameters
 	{
 		/// <summary>
-		/// The number of the pull request
+		/// The number of the test merge source.
 		/// </summary>
 		public int Number { get; set; }
 
@@ -17,7 +17,7 @@ namespace Tgstation.Server.Api.Models
 		/// </summary>
 		[Required]
 		[StringLength(40)]
-		public string? TargetCommitSha { get; set; }
+		public virtual string? TargetCommitSha { get; set; }
 
 		/// <summary>
 		/// Optional comment about the test
diff --git a/src/Tgstation.Server.Api/Rights/RepositoryRights.cs b/src/Tgstation.Server.Api/Rights/RepositoryRights.cs
index 3b3e79578f..a65ca17e0a 100644
--- a/src/Tgstation.Server.Api/Rights/RepositoryRights.cs
+++ b/src/Tgstation.Server.Api/Rights/RepositoryRights.cs
@@ -29,7 +29,7 @@ namespace Tgstation.Server.Api.Rights
 		SetSha = 4,
 
 		/// <summary>
-		/// User may fetch and merge GitHub pull requests.
+		/// User may create <see cref="Models.TestMerge"/>s.
 		/// </summary>
 		MergePullRequest = 8,
 
diff --git a/src/Tgstation.Server.Host/Components/Chat/Commands/PullRequestsCommand.cs b/src/Tgstation.Server.Host/Components/Chat/Commands/PullRequestsCommand.cs
index 56cce4cc1e..617a67f6ac 100644
--- a/src/Tgstation.Server.Host/Components/Chat/Commands/PullRequestsCommand.cs
+++ b/src/Tgstation.Server.Host/Components/Chat/Commands/PullRequestsCommand.cs
@@ -21,7 +21,7 @@ namespace Tgstation.Server.Host.Components.Chat.Commands
 		public string Name => "prs";
 
 		/// <inheritdoc />
-		public string HelpText => "Display live test merge pull request numbers. Add --repo to view repository test merges";
+		public string HelpText => "Display live test merge numbers. Add --repo to view test merges in the repository as opposed to live.";
 
 		/// <inheritdoc />
 		public bool AdminOnly => false;
diff --git a/src/Tgstation.Server.Host/Components/Events/EventType.cs b/src/Tgstation.Server.Host/Components/Events/EventType.cs
index 9b648382c9..9085c6e215 100644
--- a/src/Tgstation.Server.Host/Components/Events/EventType.cs
+++ b/src/Tgstation.Server.Host/Components/Events/EventType.cs
@@ -1,4 +1,4 @@
-namespace Tgstation.Server.Host.Components.Events
+namespace Tgstation.Server.Host.Components.Events
 {
 	/// <summary>
 	/// Types of events. Mirror in tgs.dm
@@ -24,10 +24,10 @@
 		RepoFetch,
 
 		/// <summary>
-		/// Parameters: Pull request number, pull request sha, merger message
+		/// Parameters: Test merge number, test merge target sha, merger message
 		/// </summary>
 		[EventScript("RepoMergePullRequest")]
-		RepoMergePullRequest,
+		RepoAddTestMerge,
 
 		/// <summary>
 		/// Parameters: Absolute path to repository root
diff --git a/src/Tgstation.Server.Host/Components/Interop/Bridge/TestMergeInformation.cs b/src/Tgstation.Server.Host/Components/Interop/Bridge/TestMergeInformation.cs
index 314a6d5ed3..d3dc664503 100644
--- a/src/Tgstation.Server.Host/Components/Interop/Bridge/TestMergeInformation.cs
+++ b/src/Tgstation.Server.Host/Components/Interop/Bridge/TestMergeInformation.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Globalization;
 using Tgstation.Server.Api.Models.Internal;
 
@@ -14,6 +14,18 @@ namespace Tgstation.Server.Host.Components.Interop.Bridge
 		/// </summary>
 		public string TimeMerged { get; set; }
 
+		/// <summary>
+		/// Backing field for <see cref="TargetCommitSha"/> needed to continue to support DMAPI 5.
+		/// </summary>
+		public string PullRequestRevision { get; set; }
+
+		/// <inheritdoc />
+		public override string TargetCommitSha
+		{
+			get => PullRequestRevision;
+			set => PullRequestRevision = value;
+		}
+
 		/// <summary>
 		/// The <see cref="RevisionInformation"/> of the <see cref="TestMergeInformation"/>
 		/// </summary>
diff --git a/src/Tgstation.Server.Host/Components/Repository/IGitRemoteFeatures.cs b/src/Tgstation.Server.Host/Components/Repository/IGitRemoteFeatures.cs
index 7dc7502ba7..d91dca020d 100644
--- a/src/Tgstation.Server.Host/Components/Repository/IGitRemoteFeatures.cs
+++ b/src/Tgstation.Server.Host/Components/Repository/IGitRemoteFeatures.cs
@@ -6,7 +6,7 @@ namespace Tgstation.Server.Host.Components.Repository
 	interface IGitRemoteFeatures : IGitRemoteAdditionalInformation
 	{
 		/// <summary>
-		/// Gets a formatter string which creates the remote refspec for fetching the HEAD of passed in pull request number.
+		/// Gets a formatter string which creates the remote refspec for fetching the HEAD of passed in test merge number.
 		/// </summary>
 		string TestMergeRefSpecFormatter { get; }
 
diff --git a/src/Tgstation.Server.Host/Components/Repository/IRepository.cs b/src/Tgstation.Server.Host/Components/Repository/IRepository.cs
index 84dc366a55..e2caa16611 100644
--- a/src/Tgstation.Server.Host/Components/Repository/IRepository.cs
+++ b/src/Tgstation.Server.Host/Components/Repository/IRepository.cs
@@ -48,7 +48,7 @@ namespace Tgstation.Server.Host.Components.Repository
 		Task CheckoutObject(string committish, Action<int> progressReporter, CancellationToken cancellationToken);
 
 		/// <summary>
-		/// Attempt to merge a GitHub pull request into HEAD
+		/// Attempt to merge the revision specified by a given set of <paramref name="testMergeParameters"/> into HEAD
 		/// </summary>
 		/// <param name="testMergeParameters">The <see cref="TestMergeParameters"/> of the pull request</param>
 		/// <param name="committerName">The name of the merge committer</param>
diff --git a/src/Tgstation.Server.Host/Components/Repository/Repository.cs b/src/Tgstation.Server.Host/Components/Repository/Repository.cs
index e5f14215c1..e04c113935 100644
--- a/src/Tgstation.Server.Host/Components/Repository/Repository.cs
+++ b/src/Tgstation.Server.Host/Components/Repository/Repository.cs
@@ -275,7 +275,7 @@ namespace Tgstation.Server.Host.Components.Repository
 
 			var commitMessage = String.Format(
 				CultureInfo.InvariantCulture,
-				"Test merge of pull request #{0}{1}{2}",
+				"TGS Test merge #{0}{1}{2}",
 				testMergeParameters.Number,
 				testMergeParameters.Comment != null
 					? Environment.NewLine
@@ -390,7 +390,7 @@ namespace Tgstation.Server.Host.Components.Repository
 			}
 
 			await eventConsumer.HandleEvent(
-				EventType.RepoMergePullRequest,
+				EventType.RepoAddTestMerge,
 				new List<string>
 				{
 					testMergeParameters.Number.ToString(CultureInfo.InvariantCulture),